Features of the Giro Proof Winter MTB Shoe Cover Water- and wind-resistant neoprene exterior of the proof winter MTB shoe covers Are optimized with Flex Zones in key Areas Engineered from a super stretch neoprene that minimizes bulky feel without compromising warmth and further optimized with Flex Zones in key Areas Sole includes a molded rubber bottom to help improve traction and durability when worn over mountain bike shoes Reflective detailing and locking zipper Are the finishing details in this essential winter off road shoe cover Compatible with most mountain bike shoes