Pair of versatile sleeves to protect your knees, elbows or shins. Hex patented technology is a 9mm thick closed-cell foam padding, which freely moves with you. The hDc microfiber quickly wicks away perspiration. Machine washable. Size S for 29.2-31.8 cm (11.5-12.5") circumference, M for 31.8-35.6 cm (12.5-14"), L for 35.6-40.6 cm (14-16"), XL for 40.6-47 cm (16-18"). For knee and elbow, slightly bend leg or arm and mesure circumferece directly over joint. For shin, measure circumference at the fullest part od the calf.