Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Alignment features on the components provide discrete orientations between the shaft and club head.

Abstract: A golf club head having a body having a first receptacle having ant aperture and a weight retention member affixed to the receptacle, the weight retention member having an opening, the weight retention member configured to receive a weighted insert, wherein at least a portion of the receptacle is located on the sole, wherein the receptacle includes a pair of perimeter walls, each of the perimeter walls substantially perpendicular to the sole adjacent the perimeter walls, wherein the pair of perimeter walls are separated by the aperture and are substantially parallel to one another.

Abstract: A golf club head comprising a body, a cavity having an open end and a terminal end, a weighted insert, the weighted insert comprising a heavy end and a lighter end, wherein the cavity comprises a head locking feature, wherein the weighted insert comprises an insert locking feature, wherein the insert locking feature is configured to lock the weighted insert in the cavity with less than 180 degrees of rotation, wherein the head locking feature comprises a slot, wherein the slot is arranged at an oblique angle relative to the longitudinal axis of the cavity, wherein the insert locking feature comprises a protrusion configured to engage the slot, the protrusion and the slot configured such that rotation of the insert locking feature relative to the head locking feature forces the insert locking feature to slide along the longitudinal axis of the cavity towards the terminal end of the cavity.

Abstract: A golf club head including a body having a face, a sole, a crown, and a skirt joining the face, sole and crown, the body having a center of gravity, wherein the body includes an open end and a terminal end, the terminal end opposite the open end, a weighted insert having a heavy end and a lighter end, the lighter end opposite the heavy end, wherein the cavity is configured to receive the weighted insert through the open end, wherein the cavity includes a head locking member, wherein the weighted insert includes an insert locking member, wherein the head locking member includes a shelf and the insert locking member includes a flange, the flange configured to abut the shelf when the insert locking member is in a locked position; and a spring located between the insert locking member and the terminal end of the cavity.

Abstract: A golf club head is provided with a body that has an address position with a zero degree bounce portion on the sole and a center sole position with a multi-relief surface of the sole having a negative bounce portion. The negative bounce portion may comprise a negative 0.5 to a negative 4.0 degree surface. In one embodiment, the multi-relief surface may comprise the negative bounce portion and a cutaway portion extending to the back of the sole, which may have a depth of about 0.05 to 0.5 inch from a regular sole surface. In another embodiment, the golf club head includes a weight system to adjust the center of gravity. In one embodiment, the weight system is a tube having a weight at one end that may be inserted into the golf club head to move the center of gravity at least forward and backward within 6 mm and up and down within 6 mm. Preferably, the tube is angled downward toward the face by at least 3 degrees.

Abstract: A golf club head and a removable weight that is received in a receptacle of the golf club head. The weight includes a cap and a slug. The cap is removably coupled to the receptacle and includes a recess that receives a portion of the slug so that the cap and slug are able to rotate relative to each other. The slug includes an anti-rotation feature that prevents relative rotation between the slug and the receptacle and a lead-in portion.

Abstract: A golf club head including a crown, a sole, a hosel, a face, a flexure, and a weight member. The flexure provides compliance during an impact between the golf club head and a golf ball, and is tuned to vibrate, immediately after impact, at a predetermined frequency. The flexure is formed by a forward wall and a rearward wall that combine to form a recessed channel. The weight member is coupled to a weight mount at least partially disposed in the rearward wall of the flexure.

Abstract: A golf club head having a body having a first receptacle having a first aperture, a second receptacle having a second aperture, and a first weight retention member affixed to the first receptacle, the first weight retention member having an opening, at least a portion of the first weight retention member extending through the first aperture into the hollow golf club interior; a second weight retention member affixed to the second receptacle, at least a portion of the second weight retention member extending through the second aperture into the hollow golf club interior; and a third weight retention member extending between the first weight retention member and the second weight retention member, the third weight retention member extending through the opening of the first weight retention member, at least a portion of the third weight retention member located in the hollow golf club head interior.

Abstract: A golf club head including a crown, a sole, a hosel, a face and a flexure. The flexure provides compliance during an impact between the golf club head and a golf ball, and is tuned to vibrate, immediately after impact, at a predetermined frequency to improve the performance of the golf club head. More specifically, the present invention decouples the flexure from the remainder of the golf club head.

Abstract: A golf club head including a crown, a sole, a hosel, a face and a flexure. The flexure provides compliance during an impact between the golf club head and a golf ball, and is tuned to vibrate, immediately after impact, at a predetermined frequency. A slot is included in a portion of the golf club head and works with the flexure to further tune performance.

Abstract: A golf club head having a body having a first receptacle having a first aperture, a second receptacle having a second aperture, and a first weight retention member affixed to the first receptacle, the first weight retention member having an opening, at least a portion of the first weight retention member extending through the first aperture into the hollow golf club interior; a second weight retention member affixed to the second receptacle, at least a portion of the second weight retention member extending through the second aperture into the hollow golf club interior; and a third weight retention member extending between the first weight retention member and the second weight retention member, the third weight retention member extending through the opening of the first weight retention member, at least a portion of the third weight retention member located in the hollow golf club head interior.

Abstract: A golf club head including a body having a face, a sole, a crown, and a skirt joining the face, sole and crown, the body having a center of gravity, wherein the body includes an open end and a terminal end, the terminal end opposite the open end, a weighted insert having a heavy end and a lighter end, the lighter end opposite the heavy end, wherein the cavity is configured to receive the weighted insert through the open end, wherein the cavity is configured to receive the weighted insert through the open end in both a first configuration and a second configuration, and wherein said weighted insert comprises a slideable flange.

Abstract: A golf club head having a body having a first receptacle having ant aperture and a weight retention member affixed to the receptacle, the weight retention member having an opening, the weight retention member configured to receive a weighted insert, wherein at least a portion of the receptacle is located on the sole, wherein the receptacle includes a pair of perimeter walls, each of the perimeter walls substantially perpendicular to the sole adjacent the perimeter walls, wherein the pair of perimeter walls are separated by the aperture and are substantially parallel to one another.

Abstract: A golf club head comprising a body, a cavity having an open end and a terminal end, a weighted insert, the weighted insert comprising a heavy end and a lighter end, wherein the cavity comprises a head locking feature, wherein the weighted insert comprises an insert locking feature, wherein the insert locking feature is configured to lock the weighted insert in the cavity with less than 180 degrees of rotation, wherein the head locking feature comprises a slot, wherein the slot is arranged at an oblique angle relative to the longitudinal axis of the cavity, wherein the insert locking feature comprises a protrusion configured to engage the slot, the protrusion and the slot configured such that rotation of the insert locking feature relative to the head locking feature forces the insert locking feature to slide along the longitudinal axis of the cavity towards the terminal end of the cavity.

Abstract: A golf club head including a body having a face, a sole, a crown, and a skirt joining the face, sole and crown, the body having a center of gravity, wherein the body includes an open end and a terminal end, the terminal end opposite the open end, a weighted insert having a heavy end and a lighter end, the lighter end opposite the heavy end, wherein the cavity is configured to receive the weighted insert through the open end, wherein the cavity includes a head locking member, wherein the weighted insert includes an insert locking member, wherein the head locking member includes a shelf and the insert locking member includes a flange, the flange configured to abut the shelf when the insert locking member is in a locked position; and a spring located between the insert locking member and the terminal end of the cavity.

Abstract: A golf club head including a crown, a sole, a hosel, a face and a flexure. The flexure provides compliance during an impact between the golf club head and a golf ball, and is tuned to vibrate, immediately after impact, at a predetermined frequency. A slot is included in a portion of the golf club head and works with the flexure to further tune performance.

Abstract: A golf club head made out of multi-material is disclosed herein. More specifically, the golf club head in accordance with the present invention has at least a portion of the body of the golf club head that is further comprised out of a base layer and a lightweight cover layer. The base layer may have a plurality of cutouts to help reduce unnecessary mass and the lightweight cover layer may be made out of an ultra-lightweight material to further reduce the unnecessary mass. The resulting golf club head may generally have a deep CG wherein the CG-B location is about 37 mm, and a CG-C location is greater than about 30 mm.

Abstract: A golf club head including a crown, a sole, a hosel, a face, a flexure, and a weight member. The flexure provides compliance during an impact between the golf club head and a golf ball, and is tuned to vibrate, immediately after impact, at a predetermined frequency. The flexure is formed by a forward wall and a rearward wall that combine to form a recessed channel. The weight member is coupled to a weight mount that is at least partially disposed in the rearward wall of the flexure.

Abstract: A golf club head including a crown, a sole, a hosel, a face and a flexure. The flexure provides compliance during an impact between the golf club head and a golf ball, and is tuned to vibrate, immediately after impact, at a predetermined frequency.