Air Activated: Easty to Use - Simply rip open the foil pouch to activate the molding process. The chemical components inside the soft pads react to moisture in the air, activating the hardening process. * Custom-Molding: Perfect Fit - Once activated, the soft pads transform to hard and protective, custom molding to the exact contours of each individual athlete. * Ultrathin, Lightweight: Fast, Agile - At just 1/4 of an inch thin, EvoShield"s protctive Shields are designed to act as a second skin with a unique protctive barrier. * Athletic Design: Quick, Confident - EvoShield was developed under the direct specifications of elite athletes, ensuring a custom fit that never interferes with the body"s natural movement. * Breathable: Comfortable - EvoShield"s protective Shields are encased within a breathable mesh layer that comfortably hugs the body. * Breathable Neoprene sleeve holds the ¼? inch thin Shield in place while providing tape-like compression. * Custom-molding wrist Shield disperses impact, rather than absorbs, to provide stronger protection than traditional foam or plastic padding. * Protective Wrist Guard defends you from sore wrists and bruised forearms caused by bad hops, hard grounders and wild pitches. * Reversible for protection for offense and defense. Great for catchers. Sizes available for all ages based on measurement of wrist circumference: SM 5-6?; MD 6?-7?; LG 7-8?; XL 8-9? * Straight from the Pros. Official MLB Authentic On-Field Collection item worn by all 30 MLB organizations & Elite Collegiate programs.