Sorix is a waterproof highly-insulated winter boot with serious traction that's insulated to -40°FF. Its broad, stable platform makes carrying a load or navigating tough terrain easier, and the widely spaced, deep lugs self clean and grip on soft surfaces while rubber studs grab on hard surfaces. Boa pile/Thinsulate membrane lining and Thermostatic sole with aluminum provides the ultimate warmth, and its fully waterproof upper keeps feet dry and comfortable.