S-PHYRE Insulated Shoe Covers take advantage of our Shimano Fusion Concept System Engineering and Anatomic 3D design knowledge to construct a cold-weather cover that interfaces perfectly with S-PHYRE footwearFlexible, one-piece, pull-on design delivers optimized waterproof protection and comfort in cold and wet training conditionsAn added bonus of creating shoes and shoe covers as a system is that the Boa? dials are readily accessible and adjustable without removing the covers, making mid-ride fine-tuning easyFabrics: Main body: 88% Rubber, 12% Polyamide. Part: 40% Polyster, 50% Rubber, 10% Polyamide