Stay warm and cozy even in frigid temperatures down to -40°C in the Greenbay 4 winter boot. Crafted from waterproofed 600 denier nylon, this vegan-friendly boot has an 8mm Thermal Guard removable liner, made from 100% recycled content, to provide extra insulation. The PULSE sole comes with a waterproof and recyclable lightweight RubberHe shell and is bolstered by proprietary technology to provide reliable grip in snowy conditions.