The foundation for the S-PHYRE ISO SHOE COVER comes from our experiences in system development and the anatomical 3D design of SHIMANO Fusion Concept. This resulted in a shoe cover for cold weather that perfectly harmonizes with S-PHYRE shoes. The flexible and one-piece shoe cover offers optimal waterproof protection and comfort in cold and wet training conditions. Another advantage of developing shoes and shoe covers as a system is that the rotary closures are easily accessible and adjustable without having to remove the shoe cover, simplifying fine adjustments.