EVS Youth SX01 Knee Brace - One size fits most/Black EVS SX01 YOUTH Knee Guard MX/Off-Road/Dirt Bike Motorcycle Body Armor - One Size Bilateral polycentric (6061 T6) aircraft-grade aluminum hinges Lightweight and breathable airprene construction for ultra comfort Removable knee cup Fits youth riders 10.5-12.0 in., measuring around the center of the knee