The Award winning O'Neal Sinner Knee guard just got better now with a full length flexy zipper for easy taking off and putting on. Still the ultimate knee pads for riding in comfort all day long. The IPX® protector is pleasantly soft while riding but hardens on impact, the inner lining is soft and frictionless to eliminate chafing and add comfort. The foam used out-performs most/all competitor foams on the market. For the benefit of the rider the guard is made from fast wicking and breathable material for quick drying and absorbing sweat. Velcro® straps provide a slip resistant grip, helping pads stay in place during crashes. The pads fit well under trousers or shorts while riding so you don't have to compromise on protection due to your choice of clothing. The pads also feature a removeable outer hard carbon-look shell on the knee.