Catcher"s Thumb Guard disperses impact to help protect thumb from injury or hyper-extension (including Gamekeeper"s Thumb); Perfect for both elite catchers catching 90+ MPH and youth catchers new to the position * Straight from the Pros. Official MLB Authentic On-Field Collection gear worn by all 30 MLB organizations and Elite Collegiate programs * Custom-molding technology air activates in minutes for a true custom fit to your thumb; Easy fitting process-no cutting, boiling or baking required * 1/4-inch thin Shield custom-molds inside your glove for ultimate comfort and support that won"t interfere with your game * Multi-sport use for lacrosse, football, skiing and more; Coverage Area: Large: 4.5 x 4.5-Inch; Small/Youth: 4.25 x 3.25-Inch * Catcher?s Thumb Guard disperses impact to help protect thumb from injury or hyper-extension (including Gamekeeper?s Thumb). Perfect for both elite catchers catching 90+ MPH and youth catchers new to the position. * Custom-molding technology air activates in minutes for a true custom fit to your thumb. Easy fitting process-- no cutting, boiling or baking required. * Multi-sport use for lacrosse, football, skiing and more. Coverage Area: Large: 4.5? x 4.5?; Small/Youth: 4.25? x 3.25?. * Straight from the Pros. Official MLB Authentic On-Field Collection gear worn by all 30 MLB organizations & Elite Collegiate programs. * ¼? thin Shield custom-molds inside your glove for ultimate comfort and support that won?t interfere with your game.