The Fox Titan Race Knee guards provide hard Plastic knee coverage for use under your race pants. The low profile knee pads balance a soft, vented bio-foam chassis for comfort with hard plastic protection from the nastiest impacts. With an elastic strap system with hook and loop adjustment and a one-time adjust posi-lock strap system these guards are easy and fast to fit and will stay in place thanks to the silicone print on the bio-foam.