Golf bag having elongated tubular body and shoulder strap assembly comprising first and second straps, each having first and second ends; and bridge member having first and second ends and being disposed undetachably between second end of first strap and second end of second strap; the elongated tubular body configured to be detachably adjoined to first end of first strap, first end of second strap, second end of first strap, and second end of second strap. Strap may have a first section, second section and third section that are configured to be adjacent the wearer's front, shoulder, and back, respectively; third section has curve with upper portion extending vertically with respect to wearer and lower portion extending horizontally with respect to wearer. A concave radius r.sub.cc can extend from strap first end to approximate the second end; wherein r.sub.cc>a convex radius r.sub.cv at the strap second end.

The invention relates to a ball game racket frame (12) including a head portion (14), a shaft portion (18) and a grip portion (20). The ball game racket frame (12) comprises a fiber composite material having fibers embedded in a matrix. At least 5% of the fibers are natural fibers in at least one cross-section (28, 28a, 28b, 28c, 28d, 28e) of a portion of the ball game racket frame (12).

The invention further relates to a ball game racket frame (12) in which the proportion of natural fibers in at least one cross-section (28b, 28c, 28d, 28e) of the shaft portion (18) and/or the grip portion (20), respectively, is greater than the proportion of natural fibers in at least one cross-section (28, 28a) of the head portion (14).

The invention further relates to a method for manufacturing such ball game racket frames (12).

Provided are tubular carbon fiber reinforced composite material and having excellent cylindrical bending strength and a golf club shaft using the same. This tubular carbon fiber reinforced composite material is formed by laminating and curing a straight layer and a bias layer. The straight layer comprises carbon fibers S coated with a sizing agent S and arranged in parallel in a direction of −20° to +20° with respect to the axis of the tubular body, and contains a thermosetting resin S. The bias layer comprises carbon fibers B coated with a sizing agent B and arranged in parallel in a direction of +25° to +65° with respect to the axis of the tubular body, and contains a thermosetting resin B. The carbon fiber reinforced composite material constituting the bias layer has an interlaminar shear strength of not less than 110 MPa. A cured product of the thermosetting resin S has an elastic modulus of not less than 4.0 GPa.

Embodiments of golf club heads and methods to manufacture golf club heads are generally described herein. In one example, a golf club head includes a top portion having a heel-side portion, a toe-side portion, and a raised central top portion with an opening. A shoulder portion extends inward toward the opening and a crown portion is attached to the shoulder portion and covers the opening. The bottom portion includes a central protrusion between a heel-side dividing plane and a toe-side dividing plane, a toe-side protrusion between the toe-side dividing plane and a toe-side bounding plane, and a heel-side protrusion between the heel-side dividing plane and a heel-side bounding plane. A distance between the toe-side dividing plane and the heel-side dividing plane is about equal to a diameter of a golf ball. Other examples and embodiments may be described and claimed.

Embodiments of wood-type club heads comprising one or more components are described herein. The wood-type club head comprises a first, metallic component, and a second, non-metallic component. The first component comprises the load bearing structure that forms the striking face, and portions of the crown, the heel, the toe, and the sole. The second component comprises a lightweight structure that wraps around the first component to form portions of the crown, the heel, the toe, and the sole. The first component comprises mass pads and receives removable weights to adjust the weight properties of the club head. The two-component design allows for additional discretionary mass redistribution to improve center of gravity location and moment of inertia.

A manufacturing method of carbon fiber rackets includes the steps of preparing a core material and setting a blowing bag on the core material, wrapping multiple prepreg layers of carbon fiber materials on the outside of the blowing bag to become a sample to be molded, taking out the core material and placing the sample to be molded into a mold, closing the mold and heating and pressurizing the mold, and inflating the blowing bag to harden the multiple prepreg layers, expelling the air in the blowing bag to reduce the volume of the blowing bag, and opening the mold and drawing out the blowing bag and then taking out the hardened racket frame rough embryo thus obtained.

Embodiments of golf club heads with components composed of a metal-composite-metal construction are described herein. The metal-composite-metal construction makes up a portion of the golf club head. The metal-composite-metal construction can make up any one or combination of the following structures: faceplate, face insert, internal ribs, turbulators, crown insert, or weight channel. The composite layer of the metal-composite-metal construction is composed of reinforced fibers. The metal-composite-metal construction allows for weight savings in the golf club head while maintaining durability, strength, rigidity, and performance.

A golf club head comprising two components, wherein the first component comprise a ball striking surface, a striking face return, and a sole extension with a rear mass. And wherein the second component comprises a lower density material, comprising part of the crown and part of the sole. The first component comprises a majority of the mass of the golf club head, having a rear mass comprising 20% to 35% of the mass of the golf club head.

The present disclosure relates to a shaft for athletic activities comprising, along at least a part of the length of the shaft: an internal wall (31) made of a first fiber-reinforced composite; and an external wall (30), fixed to the internal wall, and made of a second fiber-reinforced composite, wherein one or more cavities (32A, 32B, 32C) are present between the internal wall and the external wall.

Embodiments of a golf club head comprising a first component and a second component that are coupled together to enclose a hollow interior are disclosed herein. The first component comprises at least a striking face, a striking face return, and a rear extension. In some embodiments, the first component also comprises a weight channel at a rear end and one or more braces that attach to the striking face return and the rear extension. The second component comprises a crown portion, a sole toe portion, and a sole heel portion. The density of the second component is less than the density of the first component. In some embodiments, the first component mass is 85% to 96% of a mass of the golf club head.