Abstract: A batter hand guard may include a hand back portion configured to cover at least metacarpal bones of ring, middle and index fingers of the hand on the back side of the hand, a wrist back extension extending from the hand back portion and configured to cover a back of an ulna and a back of a radius of a forearm, and a wrist side extension extending sideways from the wrist back extension. The wrist side extension is formed from a moldable and hardenable material configured to wrap about the ulna from the back side to the palm side of the forearm.

Abstract: A batter hand guard may include a hand back portion configured to cover at least metacarpal bones of ring, middle and index fingers of the hand on the back side of the hand, a wrist back extension extending from the hand back portion and configured to cover a back of an ulna and a back of a radius of a forearm, and a wrist side extension extending sideways from the wrist back extension. The wrist side extension is formed from a moldable and hardenable material configured to wrap about the ulna from the back side to the palm side of the forearm.

Abstract: A protective headwear liner may include an encasement and a moldable and hardenable material within the encasement. The encasement is deformable to a U-shape while containing the material prior to hardening of the material. The U-shape may have a flat front and two flat sides corresponding to a front and sides of a person's head, respectively, wherein the two flat sides are joined to the flat front by curves. The material is configured to retain the U-shape following hardening of the material.