Distinct Name: Black/Red Size: OSFM Gender: Mens/Unisex Articulated knee design Impact-resistant, ventilated thermoplast shell with aluminumreinforced knee cup Fits knee and the side of the bike with asymmetrical form Comfortable Lycra; liner and removable impact-resistant Bio-Foam padding Adjustable hook-and-loop fastening straps Durable billet aluminum hinges Easy to clean; snap assembly design Sold in pairs One size fits most