The EVS Sports SX01 offers compression and support in a soft, form-fitting pull-on brace. Bilateral polycentric hinges offer strength and limit hyper-extension. Bilateral polycentric (6061 T6) aircraft grade aluminum hinges, Lightweight and breathable airprene construction for ultra comfort, Removable knee cup, 2 compression straps for support and comfort, For finding out your size, please look at our Knee Brace sizing chart