Abstract: Disclosed herein is an iron-type golf club head that includes a body, made of a first material having a first density The body has a sole portion that includes an internal shelf. The iron-type golf club head also comprises a weight located within the internal cavity and at least partially seated on the internal shelf. The iron-type golf club head further comprises a filler material located within the internal cavity. The internal cavity has an internal cavity volume ranging between 40 cc to 55 cc.

Abstract: A putter-type golf club head comprises a unitary construction metallic frame having a thin wall crown region, and a crown damping member attached to thin wall crown region. The unitary construction metallic frame has a frame mass of 250-370 grams, a frame density of at least 2.5 g/cc, a frame length of 40-130 mm, a frame width of 75-130 mm, a frame height of 17-30 mm, a frame front forming a portion of a striking face, a frame rear, a frame top, and a frame bottom, wherein the frame top includes a thin wall crown region having a TWCR thickness of 0.6-1.2 mm, a TWCR length, a TWCR width, and a TWCR area of at least 600 mm2.

Abstract: A golf club head having a planar strike face formed of oxidizable metal substrate including an unplated portion of the oxidizable metal substrate that is not plated and defines an oxidizable strike face surface area. A first oxidation-prevention coating permanently covers at least a portion of the body including at least a portion of the rear portion and the heel portion, and a temporary user-removable cover is located over at least a portion of the oxidizable strike face surface area and may temporarily regulate oxidation. The club head has performance and confidence inspiring ratios of the oxidizable strike face surface area divided by the total volume, as well as the oxidizable strike face surface area divided by the total planar strike face surface area, and the oxidizable strike face surface area divided by the total surface area.

Abstract: Disclosed herein is an iron-type golf club head that comprises a body, made of a first material having a first density. The iron-type golf club head also comprises a weight located within the internal cavity. The iron-type golf club head further comprises a filler material that has a density no less than 0.21 g/cc. The filler material has a mass no less than 2.5 grams and no more than 8 grams. The internal cavity has an internal cavity volume ranging between 5 cc to 20 cc. A ratio of the internal cavity volume to external club head volume ranges between 0.14 and 0.385. The internal cavity has a minimum front-to-back depth above a midplane of the golf club head of no less than 1.4 mm and a maximum front-to-back depth of the internal cavity above the midplane of the golf club head is no more than 13 mm.

Abstract: Disclosed herein is an iron-type golf club head that includes a body, made of a first material having a first density The body has a sole portion that includes an internal shelf. The iron-type golf club head also comprises a weight located within the internal cavity and at least partially seated on the internal shelf. The iron-type golf club head further comprises a filler material located within the internal cavity. The internal cavity has an internal cavity volume ranging between 40 cc to 55 cc.

Abstract: Disclosed herein is an iron-type golf club head that includes a body, made of a first material having a first density The body has a sole portion that includes an internal shelf. The iron-type golf club head also comprises a weight located within the internal cavity and at least partially seated on the internal shelf. The iron-type golf club head further comprises a filler material located within the internal cavity. The internal cavity has an internal cavity volume ranging between 40 cc to 55 cc.

Abstract: A putter-type golf club head includes a body and a hosel coupled to the body. The hosel includes a beam coupled directly to and extending along the top of the body. The hosel also includes a first strut, at a first oblique angle relative to the beam, including a first-strut lower end coupled directly to the heelward end of the beam, and including a first-strut upper end. The hosel further includes a second strut, at a second oblique angle relative to the beam, including a second-strut lower end coupled directly to the toeward end of the beam, and including a second-strut upper end coupled directly to the first-strut upper end. The hosel additionally includes a forward recess and a rearward recess. The hosel also includes a socket, coupled directly to the first-strut upper end and to the second-strut upper end, and configured to mate with a golf club shaft.

Abstract: Disclosed herein is an iron-type golf club head that comprises a body, made of a first material having a first density. The iron-type golf club head also comprises a weight located within the internal cavity. The iron-type golf club head further comprises a filler material that has a density no less than 0.21 g/cc. The filler material has a mass no less than 2.5 grams and no more than 8 grams. The internal cavity has an internal cavity volume ranging between 5 cc to 20 cc. A ratio of the internal cavity volume to external club head volume ranges between 0.14 and 0.385. The internal cavity has a minimum front-to-back depth above a midplane of the golf club head of no less than 1.4 mm and a maximum front-to-back depth of the internal cavity above the midplane of the golf club head is no more than 13 mm.

Abstract: Disclosed herein is an iron-type golf club head that comprises a body, made of a first material having a first density. The iron-type golf club head also comprises a weight located within the internal cavity. The iron-type golf club head further comprises a filler material that has a density no less than 0.21 g/cc. The filler material has a mass no less than 2.5 grams and no more than 8 grams. The internal cavity has an internal cavity volume ranging between 5 cc to 20 cc. A ratio of the internal cavity volume to external club head volume ranges between 0.14 and 0.385. The internal cavity has a minimum front-to-back depth above a midplane of the golf club head of no less than 1.4 mm and a maximum front-to-back depth of the internal cavity above the midplane of the golf club head is no more than 13 mm.

Abstract: Described herein is a golf club head. The golf club head comprises a heel portion, a sole portion, a toe portion, opposite the heel portion, a top portion, opposite the sole portion, a rear portion, and a front portion, opposite the rear portion and comprising a strike face. An outer surface of at least the rear portion and at most a limited part of the strike face is made of a non-oxidizable metal material. At least a part of the strike face is made of an oxidizable metal material.

Abstract: A golf club head having a milled planar strike face formed of oxidizable metal material and a plurality of primary grooves, and a first oxidation-prevention coating permanently covering at least a portion of the body. The primary grooves have toeward ends that may be unaligned vertically. A temporary user-removable cover may cover at least a portion of the oxidizable strike face surface area and obscure the view of at least a portion of the plurality of primary grooves, and may incorporate an opening to display a portion of the face and a portion of the plurality of primary grooves, a non-stick tab coupled to a periphery of the temporary user-removable cover, and/or an external layer of plastic-based shrink wrap. The temporary user-removable cover may be adhesively attached to the face to seal an underlying area from environmental exposure and inhibit oxidation.

Abstract: A golf club head having a planar strike face formed of oxidizable metal substrate including an unplated portion of the oxidizable metal substrate that is not plated and defines an oxidizable strike face surface area. A first oxidation-prevention coating permanently covers at least a portion of the body including at least a portion of the rear portion and the heel portion, and a temporary user-removable cover is located over at least a portion of the oxidizable strike face surface area and may temporarily regulate oxidation. The club head has performance and confidence inspiring ratios of the oxidizable strike face surface area divided by the total volume, as well as the oxidizable strike face surface area divided by the total planar strike face surface area, and the oxidizable strike face surface area divided by the total surface area.

Abstract: A golf club head having a milled planar strike face formed of oxidizable metal material and a plurality of primary grooves, and a first oxidation-prevention coating permanently covering at least a portion of the body. The primary grooves have toeward ends that may be unaligned vertically. A temporary user-removable cover may cover at least a portion of the oxidizable strike face surface area and obscure the view of at least a portion of the plurality of primary grooves, and may incorporate an opening to display a portion of the face and a portion of the plurality of primary grooves, a non-stick tab coupled to a periphery of the temporary user-removable cover, and/or an external layer of plastic-based shrink wrap. The temporary user-removable cover may be adhesively attached to the face to seal an underlying area from environmental exposure and inhibit oxidation.

Abstract: Disclosed herein is an iron-type golf club head that comprises a body, made of a first material having a first density. The iron-type golf club head also comprises a weight located within the internal cavity. The iron-type golf club head further comprises a filler material that has a density no less than 0.21 g/cc. The filler material has a mass no less than 2.5 grams and no more than 8 grams. The internal cavity has an internal cavity volume ranging between 5 cc to 20 cc. A ratio of the internal cavity volume to external club head volume ranges between 0.14 and 0.385. The internal cavity has a minimum front-to-back depth above a midplane of the golf club head of no less than 1.4 mm and a maximum front-to-back depth of the internal cavity above the midplane of the golf club head is no more than 13 mm.

Abstract: Described herein is a golf club head. The golf club head comprises a heel portion, a sole portion, a toe portion, opposite the heel portion, a top portion, opposite the sole portion, a rear portion, and a front portion, opposite the rear portion and comprising a strike face. An outer surface of at least the rear portion and at most a limited part of the strike face is made of a non-oxidizable metal material. At least a part of the strike face is made of an oxidizable metal material.

Abstract: In order to monitor an individual's posture, a cable is incorporated within a garment that is configured to be worn on an individual's upper body such that at least a portion of the cable spans an upper back region of the garment. A sensor is configured to monitor tension in the cable and to generate an alert when the tension in the cable exceeds a threshold level.

Abstract: In order to monitor an individual's posture, a cable is incorporated within a garment that is configured to be worn on an individual's upper body such that at least a portion of the cable spans an upper back region of the garment. A sensor is configured to monitor tension in the cable and to generate an alert when the tension in the cable exceeds a threshold level.

Abstract: The invention comprises a device for dual action level that allows the user to see when his aim or club holding may be out of level in two planes. The device consists of a main housing, incorporating a level, which is affixed to the putter shaft on or near the grip. The device is composed of two main members connected via a hinge. The two units are described as a level liquid chamber component unit and a putter shaft clamp unit. The level is attached to the shaft through the means of a simple grip clamp encased in the plastic housing. The invention is designed to be removed and reattached easily and without need for frequent adjustment or calibration. The invention simultaneously addresses four common problems for golfers: head angle, lie angle and swing, and inconsistent and off-center impact points. The device can be used indoors or outdoors and with or without a ball.