Dual-X adjustable wrist straps always allow for a perfect fit as kids’ hands grow World-renowned splinted support provides perfect wrist alignment Multi-layered technology foam composition supplies maximum knuckle protection Virtually indestructible Vylar exterior provides unparalleled durability Ultra-soft temperature-regulating lining keeps your hands cool Microfiber thumb makes it easy to wipe away sweat Sizes / Ages: 6 oz: Ages 6-10 8 oz: Ages 11-14