A wood type golf club head includes a face portion, a crown portion, and a sole portion. The face portion includes an impact area, a toe-side area on a toe side with respect to the impact area, and a heel-side area on the heel side with respect to the impact area. At least one groove is formed in the toe-side area and/or the heel-side area. The depth of the groove is 0.025 mm (inclusive) to 0.508 mm (inclusive). A groove area occupancy in the toe-side area is different from a groove area occupancy in the heel-side area.

Devices systems and methods are disclosed. Among other things, the devices systems and methods can facilitate ergonomic gripping of a handle; conform to the shape of a wrist; enhance golf techniques or performance; enhance racket sport technique or performance; protect a head of a user engaged in contact sports or other hazardous activities; identify concussions, in some cases in substantially real time; provide sterilization of garments; control surgical robots; allow for medical treatment of multiple subjects without disrobing; provide biometric or other data; and/or be used to train muscles or body parts for, for example, performing specified tasks using a body part.

Aspects of the invention are directed to golf club having a crown, a sole, a face, and a face alignment feature located on the face.

An aerodynamic sporting item, such as a tennis racket, is provided. The item includes a plurality of ridges on a surface of the sporting item. The ridges are aligned with a direction of flow of air across the sporting item when used. The ridges define channels between adjacent pairs of ridges and a plurality of dimples are located in the channels defined by the ridges.

A set of iron type golf club heads comprising a plurality of iron type golf club heads, the plurality of iron type golf club heads comprising a long iron, a mid iron, and a short iron; wherein each of the plurality of iron type golf club heads comprise a striking face, and wherein each of the plurality of iron type golf club heads comprise a plurality of grooves formed in the striking face extending generally from a heel side of the striking face towards a toe side of the striking face; wherein the plurality of grooves of each of the plurality of iron type golf club heads comprise an edge radius, wherein the edge radius of the plurality of grooves of the long iron is greater than the edge radius of the plurality of grooves of the short iron.

This invention provides a golf club with a club-head configured so as to decrease air resistance of the head by avoiding the air flows from retouching on the head surface. The club-head is provided with a ridge structure which contains a first ridge and a second ridge arranged at intervals in a downward direction of the air flows on at least the sole part of the head, wherein each of the ridges has the height of 0.2 mm to 3 mm and the breadth of 1 mm to 5 mm, the ridge structure being configured by plural ridges so as to displace the inclined angle of the ridges in a clockwise direction, resulting in generation of air vortex or whirls between the head surface and the surrounding air flows as shown in FIG. 2.

An iron-type golf club having selectively machined portions and attributes.

A golf club head includes a club body including a heel portion, a sole portion, a toe portion, a top-line portion, and a face portion. In some embodiments, the face portion has an ideal striking location and at least one channel defined in the face. In some embodiments, the golf club head has a striking face and at least one channel defined in the striking face. In some embodiments, the golf club head has an ideal striking location and at least one non-ideal striking location.

Embodiments of putter-type golf club head comprising a striking surface capable of achieving consistent ball speeds across the striking surface to account for various ball impact locations are described herein. The striking surface has at least two materials that differs in concentration away from the geometric center of the striking surface to provide this consistency. Consistent (or uniform) ball speed is achieved throughout the striking surface as the portion of the golf ball that contacts the striking surface interacts with at least two materials having a differing material characteristic.

Some embodiments include club heads having reinforced club head faces. Other embodiments of related club heads and methods are also disclosed.