The Castelli Diluvio UL Shoe Covers are crafted from durable 3mm thick neoprene with sealed seams to keep your feet warm, cozy, and dry during winter rides. They feature a velcro closure at the bottom for a secure fit and are compatible with all shoe types, including road, gravel, and MTB. These shoe covers are designed to withstand cold and wet conditions, ensuring nothing hinders your ride. SKU: DILUVIOULSHOECOVERBLACK/SILVERREFLEX.