Abstract: A core for incorporation into a gliding board, such as a snowboard. The core includes anisotropic structures that are oriented so that a principal axis is non-parallel to the orthogonal axes of the board. The core may be tuned to provide anisotropic structures with the load carrying ability specific to a localized region of the board.

Abstract: A gliding board has a core structure (11) constructed by bonding flat plates (14, 15) to top and bottom surfaces of a core member (13) of the shape of a rectangular or trapezoidal waveform waving forwardly and rearwardly in the longitudinal direction of the board. The gliding board has a similar longitudinal bending rigidity compared to those of the conventional gliding boards, a relatively small longitudinal torsional/bending rigidity ratio and a high lateral bending rigidity.

Abstract: A core for incorporation into a gliding board, such as a snowboard. The core includes longitudinal and transverse core segments with long grain configurations that are combined to adjust the edge hold and maneuverability of the board to accommodate particular riding characteristics. The core segments include anisotropic structures that are oriented relative to the orthogonal axes of the board to achieve the desired core characteristics. The transverse core segments are located along the side edges of the core and oriented to tune to the core edges for a particular edge hold and overall board maneuverability.

Abstract: A structurally reinforced snowboard comprising upper and lower reinforcing components positioned at upper and lower surface regions of the snowboard. The upper and lower reinforcing components have reinforcing strip portions which are vertically aligned with one another. In one preferred configuration, these extend along. end side portions of the board and converge toward an intermediate location. In other configurations, these cross with one another. The arrangement improves torsional stiffness of the board, while permitting the desired flexural stiffness profile to be obtained.

Abstract: A snowboard having a length, a width, and a height, the latter including in particular a lower reinforcement, an upper reinforcement, and at least one core located between the upper reinforcement and the lower reinforcement. The thickness of each core is demarcated by two surfaces of the core parallel to one another, and at least one of the cores has a smaller width than the width of the board in each end zone.

Abstract: The invention relates to improved compositions comprising paraffin waxes and fluoropoylmer micro powders, and to their uses in products and articles where reduced friction is desirable, such as snow slider equipment.

Abstract: Gliding board devices and methods of making gliding board devices wherein at least a portion of the device is formed of a bulk amorphous alloy material are provided. The gliding board device including an upper reinforcing element that covers at least the upper surface of the device; a lower reinforcing element; a sliding element; a pair of running edges; and a core of filler material disposed between the upper and lower elements, wherein at least one of the upper reinforcing element, lower reinforcing element and pair of running edges are formed from an amorphous alloy.

Abstract: A gliding apparatus having a binding interface device connected to a ski, the ski including a front plate having a mounting zone provided for a front retaining element, a rear plate with a mounting zone provided for a rear retaining element, a connection between the two front and rear plates, each plate being extended along the length of each side edge of the ski by a lower wing, and there being a journal element for binding the wings to the ski, wherein the ski has, at least along a portion of its width, a localized increase in thickness in two longitudinally spaced zones for binding the interface device and corresponding to the affixing of the journal elements.

Abstract: A gliding board having a center core, a gliding sole, at least one lower reinforcing layer, and at least one upper reinforcing layer, the layers being positioned on both sides of the board. At least the upper reinforcing layer is formed of two strips that are different in nature each of which respectively extends, into the extension of the other from the central zone of the ski to each of its ends, the strips being different by the nature of the reinforcing material used or, in the case of two strips of resin reinforced with fibers, by the orientation of the fibers, or the basic weight of the fibers. In the case of a ski, the strips that are different in nature are superimposed in the central zone of the board and reinforce the zone of the ski where the mounting of retaining elements is provided.

Abstract: A ski or other board for gliding over snow has two lateral, longitudinal edges constituted by rigid, distinct elements called “sidewalls”, which comprise a multitude of discrete metallic inclusions incorporated therein and distributed in their structure, made of corrosion-proof metal of shiny appearance. Such sidewalls are made of thermosettable or thermoplastic polymer materials.

Abstract: A laminated skateboard deck is disclosed including a top sheet with a high friction surface configured for direct contact with the shoes of a rider, a first layer of fiberglass in contact with the top sheet, a wood core in contact with the first layer of fiberglass, a second layer of fiberglass in contact with the wood core, a third layer of fiberglass in contact with the second layer of fiberglass, an aramid tissue layer in contact with the third layer of fiberglass, a racing base in contact with the third layer of fiberglass and a protective edge in contact with and encircling said racing base. The protective edge may be formed of a hard metal or plastic material. The laminated skateboard deck may also include protective plates protecting the nose and tail of the deck. Additionally, the laminated skateboard deck may include pre-drilled mounting holes or reinforced mounts for affixing truck assemblies.

Abstract: Alpine ski comprising a front area known as the tip area (2), a rear area known as the tail area (4), and an intermediate area known as the mid-section (3) designed to receive a stop (12) and a heelpiece (13) comprising the binding of the boot of a skier. In this ski, the rigidity, namely the resistance to flexing in the lengthwise direction of the ski, of the center part of the mid-section (3) is less than the rigidity in the two end parts of the mid-section (3), namely the parts that connect with the front (2) and rear (4) areas.

Abstract: A structurally reinforced snowboard comprising upper and lower reinforcing components positioned at upper and lower surface regions of the snowboard. The upper and lower reinforcing components have reinforcing strip portions which are vertically aligned with one another. In one preferred configuration, these extend along end side portions of the board and converge toward an intermediate location. In other configurations, these cross with one another. The arrangement improves torsional stiffness of the board, while permitting the desired flexural stiffness profile to be obtained.

Abstract: A snowboard (110) includes a body (22) formed from a primary core (130) reinforced by a structural layer (132, 134) that wraps the primary core. A secondary core formed from first and second binding lifter plates (120) is disposed above the body and adhered thereto with an elastomeric layer (142). A top layer (136) overlies the secondary core and the exposed portions of the body to integrate the secondary core into the snowboard. The snowboard further includes a bottom layer (138) reinforced with edge strips (140). The integrated modular lifter plates provides additional leverage and vibration dampening at selected regions of the snowboard without significantly impacting the torsional and longitudinal flexibility of the center section (112) of the snowboard.

Abstract: The invention relates to a glide board having at least one entropy-elastic inlay arranged at any position on the glide board between its top layer and the layers thereunder. In accordance with the invention, the region of the surface beneath which the entropy-elastic inlay is disposed in raised with respect to the remaining glide board surface.

Abstract: An improved skateboard having laminations which are respectively selected from at least two or more materials, one material being wood and the other material being non-wood. Lamination of the two or more materials consisting of wood and non-wood plys positioned in proportionate lengths and order, combines to structurally enhance the completed lamination. The difference in physical properties between the wood and non-wood plys and the placement thereof yields a laminated skateboard with greater resilience, strength and elasticity than previous wood and/or non-wood constructions.

Abstract: A snowboard and the like with very low weight and high mechanical strength, comprising a core made of foamed plastics which is arranged between a lower layer and an upper layer of fabric impregnated with epoxy resins. The core can be shaped and rigidly coupled to the layers by molding in a heated mold. There is also provided a base with a corresponding lamina, associated with the lower layer, and a topskin element associated with the upper layer.

Abstract: A snow ski of the type having separately constructed and joined together upper and lower elongate ski sections wherein the two sections are joined together by an elongate slide rail which slidingly interconnects the opposed faces of the upper and lower ski sections together. A connector arrangement is provided for captively holding the two sections together along the slide rail to thereby permit relative sliding movement between the upper and lower ski sections when the snow ski is flexed longitudinally. The lower ski section preferably is relatively thin and of uniform thickness between its ski tip and ski tail and is also uncambered. A camber is imparted to the lower ski section when it is slidingly interconnected to the upper ski section which itself on its lower surface is longitudinally curved. The upper ski section also preferably functions as a torsion tube and is more resistant to longitudinal flex and lateral twist than the lower section to which it is attached.

Abstract: A board for gliding over snow is provided which is structured such that it has a central support region having a cross-section selected from the group consisting of the sandwich cross-section, the shell cross-section, and the hybrid cross section; a front region located between and connecting the central region and a tip; and a rear region located between and connecting the central region and a tail portion. The front region, central support region, and rear region each may have either a sandwich cross-section, a shell cross-section, and a hybrid cross section. The sandwich cross-section can have a first upper layer, a first upper reinforcement layer, a first core, a plurality of longitudinal reinforcing elements, a first lower reinforcement, a first sole, and a plurality of first edges.

Abstract: A core for incorporation into a gliding board, such as a snowboard. The core includes anisotropic structures that are oriented so that a principal axis is non-parallel to the orthogonal axes of the board. The core may be tuned to provide anisotropic structures with the load carrying ability specific to a localized region of the board.

Abstract: A sports implement includes an electroactive element such as a piezoceramic sheet attached to the implement and a shunt circuit attached to the electroactive element to counteract strain or alter stiffness of the implement to affect its performance. In a ski, one shunt circuit is neither a linear nor a highly tuned shunt, but is a low Q resonant inductive shunt tuned to a performance band of the ski to enhance dissipation of energy from of the electroactive element. The performance band includes at least one structural mode of the ski and a neighborhood of that mode. The neighborhood may include variations in the frequency of a first or higher free structural resonance which arise from production variations or size variations of the ski or its components.

Abstract: A board, such as a ski or snowboard, that includes a piezoelectric damper. A sensor such as a piece of piezoelectric material is located on the body of the board such that, as the board vibrates or deforms, the piezoelectric sensor is also deformed. As the piezoelectric sensor deforms, it produces an electrical signal that is provided to a control circuit. The control circuit receives the electrical signal and generates a control signal of proportional amplitude and frequency, but an inverse waveform to the sensed vibration. The control signal causes a piezoelectric damper to stiffen and resist deformation of the board, thus damping the vibration. The sensed signal may also be stored within a memory device and subsequently downloaded to provide a skier profile for analysis.

Abstract: A snowboard (4) includes a core (10) having tip and tail portions (20, 22) with a center portion (9) therebetween. The tip and tail portions both include lightweight, high strength honeycomb material (18) to reduce the mass moment of inertia of the snowboard. Doing so reduces the spin weight of the snowboard and permits the user to turn the snowboard about a vertical axis (26) more easily.

Abstract: A gliding board including:a lower assembly (1) which constitutes the gliding sole (2) and may or may not be bordered by edges (3, 4);an upper assembly (5) comprising at least one outer layer forming the upper face (6) and the flanks (7, 8),a core (10) which is intended to fill the space contained between the lower assembly (1) and the upper assembly (5) and consists of an expanded polyurethane foam;at least one reinforcing element (15, 16) which is arranged under the outer layer (6) and/or on the sole (2) and is impregnated with a cross-linked resin;an intermediate bonding element (17, 18) interposed between the reinforcing element (15, 16) and the filling core (10), wherein said intermediate bonding element (17) consists of a porous sheet, coated and partially sealed on each face with a latex-based solution so that the face in contact with the core (10) is superficially impregnated with polyurethane foam, and the face in contact with the upper assembly (5) is superficially impregnated with the resin of the r

Abstract: The plastic ski coating contains a filling material mixture of fluorographite and soot. By way of this combination the sliding characteristics of the coating on snow is surprisingly improved.

Abstract: Gliding board, especially a snowboard with a composite structure, constituted by a solid core about which are adhered, on the one hand, at least one upper mechanical resistance element, and on the other hand, at least one lower mechanical resistance element on which a gliding bottom surface surrounded with a peripheral metallic running edge is arranged, wherein the metallic running edge is constituted by at least one steel shaped element whose length is substantially equal to the periphery of the bottom surface, and whose free ends are affixed to one another at a butt connecting point via an effective mechanical linkage device, so as to obtain a running edge that closes over itself.

Abstract: A protective tip cover is provided for a tip of a snowboard, surfboard, bodyboard, windsurfing board, or other sport board. It includes an integral body of energy absorbing elastomeric plastic having a channel-shaped cross-section interior surface and a rounded exterior surface front portion, and an external top and bottom. Disposed within the channel-shaped interior is a tie coat for tieing an adhesive to the body, and a pressure sensitive adhesive--preferably in the form of a double-faced tape--with a first face engaging the tie coat. The adhesive has properties which will provide secure adhesion of the body to a sport board. A release sheet engages the adhesive and when removed the tip cover can be secured to the sport board nose or tail. The protective tip cover when used with a snowboard is abrasion resistant (e.g. an abrasion resistance according to ASTM D 1044 (H-22 Wheel) of less than 10, typically about 3) and retains its energy absorbing and abrasion resistance properties at temperatures below 0.

Abstract: The invention concerns a gliding board, especially a snowboard, which is intended to support both boots of a skier. The board includes a base structure of which at least the front end is turned up to form the shovel. It further has a central zone with two mounting zones for the binding elements, a front zone, and a rear zone. The board has, at least in one of the front or rear zones, a long reinforcement shaped according to the length and width of the zone. The reinforcement extends from the vicinity of the end of the front or rear zone to at least the vicinity of the mounting zone located near the zone.

Abstract: A torsion box, useful for skis, snowboards or the like, has a constant cross section and a hollow interior. The torsion box is made from a plurality of plies and a resin matrix, at least some of the plies consisting of fibers disposed at an angle with respect to a longitudinal axis of the torsion box. The plies include fibers preferably selected from the group consisting of glass, carbon and Kevlar.RTM.. Particularly, the fibers will be angled with respect to the longitudinal axis of the torsion box within a range of about 0.degree. to about 45.degree.. The torsion box may be made by a pultrusion process where the desired fibers are pulled through a resin bath, or injected with resin, and heated in a die, then cut to a desired length. The plies are arranged to impart a material imbalance to the torsion box so that, upon cooldown, the product exhibits a predetermined camber.

Abstract: There is disclosed a sliding device, in particular a ski (1), having a carrying structure (1') as well as a core (11) at least substantially rigidly connected therewith, and a binding carrier arranged above the core (11) in the longitudinal middle portion of the sliding device and extending at least over the binding area in the longitudinal direction of the sliding device, the binding carrier being elastically supported relative to the carrying structure and the core (11) so as to avoid a transmission of oscillations and impacts from the ski (1) to the ski binding; to increase the stiffness and for an improved introduction of forces, the binding carrier is designed as a deflection-resistant shell carrier (2; 2'; 2") which also laterally embraces the core (11). (FIG.

Abstract: A board for gliding on snow, such as a ski, comprises, in its support region, a device for mounting a boot binding. The device comprises at least one lower element that bears on the lower edge of the board and may laterally cover the edge, at least one upper element that forms a platform for mounting a boot binding, and at least one connecting element between each lower and upper element. Each lower element is supported by the corresponding lower edge of the board, and the assembly of the lower element, the connecting element, and the upper element is rigid.

Abstract: A recreational board which adapted to be ridden by a user has a thermoplastic upper portion with an outer surface and an inner surface, a thermoplastic lower portion including a plurality of flanges, is bonded together by joining the plurality of flanges to the inner surface of the upper portion.

Abstract: A snow board comprising a flexible core element enveloped by a covering of resin impregnated fiberglass wherein the core includes a plurality of parallel grooves running the longitudinal direction of the board such that in conjunction with resin impregnated fiberglass form a series of parallel integral hollow beam members increasing the strength of the board while simultaneously reducing the overall weight

Abstract: This invention relates to formulations useful as lubricants for polyethylene snow sliders such as skis, snowboards and sleds. Lubricants of this type are comprised of i) waxes, ii) carbon fluorides of which the basic structure is represented by the formula CF.sub.x wherein x has values ranging from 0.1 to 1.2 and, iii) fluorinated additives of the formulaR.sub.f X(CH.sub.2).sub.m CH.sub.3wherein R.sub.f is independently a straight or branched perfluoroalkyl group; X is a direct bond, SO.sub.2 NH, SO.sub.2 N(R) wherein R is an alkyl group of up to six carbon atoms, or X is an alkylene group of up to ten carbon atoms interrupted by one or more --O--, --SO.sub.2 --, or --S-- groups; m is an integer from 4 to 30.

Abstract: A ski has an elongate body with an upper surface and a binding mounting portion on the upper surface of the elongate body. The binding mounting portion has a front end and a rear end defining a boot support surface. The binding mounting portion has a first height at the front end and second height at the rear end with the second height being greater than the first height to dispose the boot support surface at an angle with the rear end higher than the front end of the boot support surface.

Abstract: A sliding device, in particular a ski, comprises a sliding body and means on the sliding body for controlling vibration thereof. The controlling means comprises at least one sequence of a plurality of spatial, planar or linear areas, each of which is distinguished from at least a part of its vicinity by at least one differently dimensioned or distributed vibration parameter. The center distances between subsequent distinguished areas, or the distances between certain sections within subsequent distinguished areas, is dimensioned according to at least one predetermined increasingly or decreasingly varying progression. The increasingly or decreasingly varying distances are configured such that the areas establish a vibration active structure of the sliding body with a plurality of natural or resonant frequencies.

Abstract: A ski structure has a core that can be provided with reinforcing elements and is provided with upper and lower covering elements. At least one cavity is provided in the core and has a terminal end that terminates in at least one of the upper surface and lower surface of the core. The ski structure cavity is covered by at least one of the upper and lower covering element and the edges of the ski. At least one block made of, for example, elastic, hyperelastic, or viscoelastic material is provided in the at least one cavity. The height of each block is preferably greater than 5 mm while the ratio between the height and the length of the block is preferably between 0.3 and 7.

Abstract: A method of constructing a ski, snowboard, or the like having a base, a core, and a top is disclosed. The method includes the steps of providing an insert plate, placing the insert plate between the base and the top, substantially surrounding the insert plate with the core, and joining the base and the top to the core. Bindings may be secured to the insert plate by fastening them to the insert plate. The insert plate includes a substantially flat portion and a plurality of threaded inserts extending upwardly to the insert plate. The inserts are integrally formed with the flat portion by being stamped from a metal plate that forms the flat portion. Apertures are also formed in the metal plate such that frame arms extend between the individual inserts to support the inserts and hold them with respect to one another. The insert plate is placed between the base and the top in a position relative to the base and the top for optimum securing bindings to the insert plate.

Abstract: A snowboard having a forward end with a shovel and rearward end with a heel. The forward shovel and rearward heel include forward and rearward contact areas on both the right and left sides. The snowboard includes a base sheet, a core, a top sheet, forward and rearward binding fastening regions, and a first reinforcement member. The core is disposed above the base sheet. The top sheet is disposed above the core. The forward and rearward binding fastening regions are disposed between the shovel and heel. The first reinforcement member is disposed between the core and the top sheet and extends from adjacent one of the forward and rearward binding fastening regions to adjacent both contact areas on one end of the snowboard. The first reinforcement member includes a right leaf spring member and a left leaf spring member. The right leaf spring member extends generally from the binding fastening region toward the right contact area.

Abstract: The invention relates to a process for decorating a composite article including the preparation of a decorated complex to be assembled with a reinforcement structure of the article made of a resin, that is capable of flowing when heated, during a subsequent cycle of hot pressing, wherein it includes a first cycle, during which the transfer of a decoration is undertaken using the method for imprinting sublimate ink(s) on the first surface of a layer made of a transparent or translucent plastic material; and a second cycle during which one undertakes, by means of an adhesion film, the hot or press assembly, on the first surface thus decorated, of a contrast sheet made out of a material selected from the group constituted by the non-anodized aluminum, the synthetic dry fiber, wood. The invention enables the decorative patterns to be developed by means of varied and very attractive backgrounds effects, such as woven, metallized or grained backgrounds, depending upon the type of contrast sheet used.

Abstract: A ski having a stressed-skin design, in which the inner supporting structure is covered at the sides and above by a skin of preferably un-reinforced plastic which is joined to a flat bottom assembly consisting at least of the running surface and, optionally, steel edges. The internal space between the upper skin, consisting of a shaped plastic top sheet, and the components making up the bottom assembly contains one or more hollow bodies whose walls are made of fibre-reinforced plastic.

Abstract: A layer of low density elastomeric material is interposed between upper and lower segments of a ski, the layer and upper segment extending along at least 35% of the length of the lower segment. The elastomeric layer contains at least one insert of high density material disposed in a direction across the width of the ski, the insert being of greater density than the low density elastomeric material to provide torsional rigidity to a ski which otherwise has softened longitudinal flexibility and enhanced vibration damping.

Abstract: A ski is provided including a front tip and a rear tail, wherein a shovel portion is defined adjacent the ski tip and a tail portion is defined adjacent the ski tail. A middle portion of the ski is located between the tip and tail portions. The middle portion is very stiff, and the tail portion is very flexible. The peak stiffness coefficient of the middle portion is at least 200,000 lb-in.sup.2. There is no upper limit to the stiffness of the middle portion. The tail portion of the ski has a peak stiffness coefficient of less than 10 percent of the peak stiffness coefficient of the middle portion of the ski. The peak stiffness coefficient of the tail portion of the ski is less than 20,000 lb-in.sup.2. The high stiffness of the middle section of the ski is preferably achieved through the use of at least two carbon graphite fiber plates (or similar stiff material) incorporated into the body of the middle and shovel portions of the ski.

Abstract: In a ski with a body consisting of several elements that are arranged parallel and in layers and connected by adhesives and/or form-fit into each other it is proposed to arrange shaped elements (12, 13, 16) in layers that extend over most of the length of the ski body and consist of a supporting element (16) that is provided with longitudinal cavities (20, 21) in which the longitudinal ribs provided for this purpose on two anti-shock elements (12, 13) are inserted. Anti-shock layers (14, 15) of an elastomer material are inserted between the elements (12, 13, 16). The ski is characterized by good shock absorption properties and even running.

Abstract: A snowboard having torsional reinforcement elements along portions of the board is provided. The snowboard includes a core, an upper structural layer disposed above the core, a top layer, two groups of binding fasteners, and torsional reinforcement elements in the forward and rearward portions of the board. The top layer is disposed above the upper structural layer. The fasteners are secured through the upper structural layer within the core. The fasteners are adapted for securing a binding to the snowboard generally along the longitudinal axis of the snowboard. The fasteners include forward fasteners for securing a forward binding and rearward fasteners for securing a rearward binding. A first torsional reinforcement element extends around the rearward fasteners along the longitudinal center axis of the snowboard above the core. The rearward reinforcement element includes a right leg extending from the rearward end of the fasteners toward the right heel contact point of the snowboard.

Abstract: A board, such as a ski or snowboard, that includes a piezoelectric damper. The piezoelectric damper is located on the body of the board such that, as the board vibrates or deforms, the piezoelectric material is also deformed. As the piezoelectric material deforms, it produces an electrical signal that is provided to a control circuit. The control circuit receives the electrical signal and either provides a resistance to the electrical signal or provides a control signal to the piezoelectric material. The resulting resistance or control signal causes the piezoelectric material to resist the deformation of the board, thus acting as a damper. The piezoelectric damper may be located between the bindings on the board, or may be located in front of the forward binding, behind the aft binding, or in more than one location. In the preferred embodiment, the piezoelectric damper is formed of one or more layers of piezoelectric material on which an electrical grid has been mounted.

Abstract: A composite torsion box core for a snowboard comprises a center core member of lightweight wood or foam enveloped within a composite of a seamless, large diameter tubular sock. By expanding or compressing the length of the large diameter tubular sock during fabrication, the alignment of fibers within the sock is adjusted for programming a desired longitudinal and torsional rigidity relationship for the snowboard. Furthermore, side members, comprising separate composite torsion box cores having smaller diameter tubular socks, are disposed on opposite sides of the center core member and provide increased side strength for the overall torsion box core for enhancing the snowboard's edging strength without compromising torsional flexibility. Plural side members of various materials, sizes and spacing relative to each other are employed to provide snowboards having differing ride characteristics.

Abstract: An improved composite ski structure comprising a core with a successful layering of at least two alternately diagonally offset composite layers, covered by two outer longitudinal layers. Both the top and bottom surfaces of the core are layered in this fashion, and the composite layers are preferably applied as a multi-layered outer laminate wrapped fully around the core. In a preferred form, a multi-functional epoxy is applied to bond the inner surface of the composite laminate to the core. In a further form of the invention at least the tip, and preferably also the tail of the core are formed from composite inserts, and at least the tip section of the outer laminate is cut in a herringbone pattern to be wrapped around a curved/angled tip without stress cracking. The invention also comprises a method for making a ski structure as described.

Abstract: .[.This.]. .Iadd.A .Iaddend.ski comprises longitudinal reinforcing elements, each bearing on one edge, and forming the sides of the ski, at least one of them extending over a part of the height of .[.this.]. .Iadd.the .Iaddend.ski, and a shell forming the upper face and a part of at least one of the lateral walls of the ski, and the longitudinal borders of which rest and are fixed on the upper face of the sides, the respective heights of a side and of the shell on at least one of the lateral parts of the ski varying in the same proportions over the length of the ski.

Abstract: A ski with a non-rectangular cross section has a filling core, for example made of polyurethane foam, a shell forming the upper face and at least a part of the lateral faces of the ski, a lower face equipped with longitudinal metal edges and with a central sliding sole. The ski includes two longitudinal reinforcement elements which extend at least in the binding mounting area of the ski and are arranged on either side of the core, each reinforcement element has a lower face which extends to a great extent over the width of an edge so as to afford it an effective support, and extends over at least a part of the height of the ski, the reinforcement elements not being covered laterally by the shell and thus forming the narrow sides of the ski, at least in the binding mounting area of the ski.