Evo Shield Catcher's Thumb Guard - Protect your game with EvoShield’s custom-molding Catcher’s Thumb Guard, designed by the nation’s top professional athletic trainers. This thin guard fits comfortably inside your glove, acting as a stabilizing brace to support the thumb and provide impact protection for the palm. The Gel-to-Shell™ Shields custom form and disperse impact to protect better than traditional foam or plastic protective gear. Just open the pack and slide the soft shield over the area of desired protection. Wrap the guard with the enclosed gauze to hold it in place. It will air-activate, starting the molding process and transforming to a stiff protector in minutes. Once formed, the Gel-to-Shell Shield stays hard, for all-season protection. Includes one washable, hourglass-shaped guard. Size small: 4.25" x 3.25" coverage area. Size large: 4.5" x 4.5" coverage area.