Any rider that wants to relieve tension on knees and ankles needs to try these irons. Made of one of the strongest hi-tech polymers produced by DuPont. The integrated 3D swivel action treads are positioned on a shock absorbent layer to relive tension on knees and ankles.... (read more) The wide tread provides a more secure and comfort foundation. Features a cool carbon fiber print look. Weight: 225 grams per iron.