S, M, L, XL4-way stretch, lightweight, perforated 0.5mm AriaprenePro with Polygiene Odor Control TechnologyAramid fiber abrasion resistant fabric knee coverage3D molded CE certified foam knee protectorLateral and medial side padding for extra protectionEasy on/off feature (dont have to take off shoes)Interior patella supportPre-curved ergonomic patterning for enhanced fitSilicon gripper elastic