A pre-molded or moldable shaft grip includes a pre-configured or moldable section disposed within a substantially circular outer grip layer. A pre-configured or moldable section substantially conforms to a player's grip, facilitating consistent finger placement. The pre-configured section may comprise the shaft, a separate section, or multiple sections of varying durometer. The moldable section may include a layer of moldable material, or a cavity disposed between the outer grip layer and the shaft containing a moldable substance. Overall grip durometer can be adjusted by varying the pressure within the cavity.

Presently disclosed grip assemblies provide for a selectively removable and replaceable grip for a shaft. Such grip assemblies include a grip sleeve and a grip liner at least partially fixed to an inner grip surface of the grip sleeve. The grip liner is configured to expand as the grip sleeve and grip liner are positioned on the shaft. The grip liner includes a liner feature that engages a shaft feature, which may be integrally formed on the shaft, or may be formed on a shaft sheath on the shaft. Engagement of the liner feature with the shaft feature may align the grip sleeve to the shaft and may substantially prevent rotation of the grip sleeve with respect to the shaft once the grip sleeve is on the shaft. Presently disclosed grip sleeves may be selectively removed from the shaft without damaging the grip sleeve, and without requiring solvents or specialized tools.

Presently disclosed grip assemblies provide for a selectively removable and replaceable grip for a shaft. Such grip assemblies include a grip sleeve and a grip liner at least partially fixed to an inner grip surface of the grip sleeve. The grip liner is configured to expand as the grip sleeve and grip liner are positioned on the shaft. The grip liner includes a liner feature that engages a shaft feature, which may be integrally formed on the shaft, or may be formed on a shaft sheath on the shaft. Engagement of the liner feature with the shaft feature may align the grip sleeve to the shaft and may substantially prevent rotation of the grip sleeve with respect to the shaft once the grip sleeve is on the shaft. Presently disclosed grip sleeves may be selectively removed from the shaft without damaging the grip sleeve, and without requiring solvents or specialized tools.

A handle grip control device configured to be removably secured to a handle of an instrument includes a body having a first outer surface and an inner surface, and a protrusion extending radially outwardly from a respective proximal end at the first outer surface of the body to a distal tip. The inner surface defines a cavity configured to receive handles of instruments, and the protrusion can define a second outer surface that includes a first and second sloped surfaces opposite to a bottom surface. A slope of the first sloped surface defines a first angle relative to a plane that is perpendicular to a longitudinal axis of the body, and a slope of the second sloped surface defines a second angle relative to the plane that is greater than the first angle.

A handle grip control device configured to be removably secured to a handle of an instrument includes a body having a first outer surface and an inner surface, and a protrusion extending radially outwardly from a respective proximal end at the first outer surface of the body to a distal tip. The inner surface defines a cavity configured to receive handles of instruments, and the protrusion can define a second outer surface that includes a first and second sloped surfaces opposite to a bottom surface. A slope of the first sloped surface defines a first angle relative to a plane that is perpendicular to a longitudinal axis of the body, and a slope of the second sloped surface defines a second angle relative to the plane that is greater than the first angle.

A golf training device, having a shaft having a butt end, an upper grip connected at the butt end, and a lower hand positioner mounted for sliding movement on the shaft. The lower hand positioner includes a contour for positioning a trailing hand of a user in a neutral position on the lower hand positioner when the user grips the upper grip with a leading hand and the lower hand positioner with a trailing hand.

A golf training device, having a shaft having a butt end, an upper grip connected at the butt end, and a lower hand positioner mounted for sliding movement on the shaft. The lower hand positioner includes a contour for positioning a trailing hand of a user in a neutral position on the lower hand positioner when the user grips the upper grip with a leading hand and the lower hand positioner with a trailing hand.

A flexible grip for a golf club having in one version a groove with an acute angle undercut grove in either or both the inner and outer surface to improve gripability. In another version, either or both of the inner and outer surface may be textured with peaks and valleys with radius less than 0.2 mm. In another version, either or both of the inner and outer surfaces may have a textured surface with raised portions having a height less than 0.3 mm. In another version, either or both the inner and outer surface may have a microtexture with raised portions having a transverse section width not greater than 0.3 mm with a height about 2 multiples of the transverse section width. In another version, the wall of the grip has voids or hollow spaces for improved cushioning for the user's grip.

A flexible grip for a golf club having in one version a groove with an acute angle undercut grove in either or both the inner and outer surface to improve gripability. In another version, either or both of the inner and outer surface may be textured with peaks and valleys with radius less than 0.2 mm. In another version, either or both of the inner and outer surfaces may have a textured surface with raised portions having a height less than 0.3 mm. In another version, either or both the inner and outer surface may have a microtexture with raised portions having a transverse section width not greater than 0.3 mm with a height about 2 multiples of the transverse section width. In another version, the wall of the grip has voids or hollow spaces for improved cushioning for the user's grip.

Provided is a customized golf club grip and methods of forming the same. The customized golf grips may include customization based on pronation and supination, a computer aided system for producing customized golf grips, a mold for producing a customized grip, a smart grip and use thereof for a customized grip, and the like.