Abstract: An item of footwear, in particular for sport, includes a sole, a double-crossbow shaped elastic structure, having an upper wall and a lower wall which define an empty space inside them. The elastic structure is placed in the sole so as to elastically react under the weight of a foot. An element extends from one of the walls and is suitable for going into abutment against the opposite wall when the crossbow structure is not compressed.

Abstract: Buttress for shoes able to be inserted in the heel area of a shoe comprising a locking portion and a yielding portion, less rigid than said locking portion. The locking portion has an upper profile provided, at least in correspondence with an area of first coupling, with a plurality of appendages projecting substantially upwards. The yielding portion has a lower profile having at least an area of second coupling that is substantially counter-shaped and coupled to the area of first coupling. The locking portion further comprises a rear area and two lateral areas (7), the rear area (6) being laterally integral with each of the lateral areas.

Abstract: Sole structure able to associated to an upper of a shoe, having first ducts in the area of the plantar arch and of the tip and one or more lateral openings in the heel area. In the heel area is obtained a seat for a counter-shaped insert provided with at least an elastically compressible central area, inferiorly communicating with second ducts communicating in turn with third ducts obtained superiorly to the insert and communicating with the first ducts and with the openings, and through the interposition of a gasket permeable to air but not to water. The insert has an upper surface whereon is obtained a central area, elastically compressible and inferiorly communicating with a cavity, obtained on a lower surface of the insert, in such a way that to a deformation of the central area corresponds a variation of the volume of the cavity.

Abstract: Buttress for shoes able to be inserted in the heel area of a shoe comprising a locking portion and a yielding portion, less rigid than said locking portion. The locking portion has an upper profile provided, at least in correspondence with an area of first coupling, with a plurality of appendages projecting substantially upwards. The yielding portion has a lower profile having at least an area of second coupling that is substantially counter-shaped and coupled to the area of first coupling. The locking portion further comprises a rear area and two lateral areas (7), the rear area (6) being laterally integral with each of the lateral areas.

Abstract: An insole for shoes for soccer, running or similar sports having a contoured plate-like element made of plastics, which has a first through slot composed of a transverse portion which lies ahead of the position of the line of optimum flexing of the foot, and of two longitudinal portions which protrude from the preceding portion toward the plantar arch. The insole further having a second through slot which extends from the outward region of the heel, adjacent to the plantar arch, and has a first portion directed forward, a second portion directed backward, and a wider end portion arranged in a central rear region.