Rated to -40°C/-40°F. Waterproof insulated mid-calf boot designed to keep you warm and dry in the coldest, wettest conditions. Waterproof Nubuk and waterproof fine-nap suede leather upper with Australian shearling sheepskin collar and 400 grams of Primaloft insulation. Injection-moulded TPU shell with nylon shank and forefoot flex grooves. EVA midsole. TNF Winter Grip rubber outsole.