The GripGrab Arctic X Deep Winter MTB/CX Shoe Covers are one of the warmest shoe covers available on the market, and designed for riding cyclocross and mountain bike on very cold winter days. Made from 4 mm thick fleece-lined waterproof neoprene, they provide maximum insulation and water-repellence. These zipper-less overshoes also feature IntelliSeal™ – an ingenious technology that greatly enhances the durability and water resistance thanks to the coated seams at the bottom of the shoe covers.The Arctic X model has an open sole design, and Kevlar® reinforced base, to allow the shoe cover to work with your MTB SPD shoes. Keep riding, however cold and wet the winter gets.