EvoShield Softball Catcher's Thumb Guard, Black, One Size Catcher's Thumb Guard disperses impact to help protect thumb from injury or hyper-extension (including Gamekeeper's Thumb) Custom-molding technology air activates in minutes for a true custom fit to your thumb; Easy fitting process-- no cutting, boiling or baking required " thin Shield custom-molds inside your glove for ultimate comfort and support that won't interfere with your game Once formed, the Shield is hand washable and provides season long protection Multi-sport use for lacrosse, skiing and more; Coverage Area: Large: 4.5" x 4.5"; Small/Youth: 4.25" x 3.25"