These are the snow boots rated to keep feet warm in temperatures as low as -148° F—a rating greater than any other boot in the world. Tested at both the North and South poles, the waterproof boots are constructed from durable, impermeable natural rubber and are insulated with a multi-layer system that wicks away moisture, retains body heat, controls odor, and repels cold temperatures. The uppers contain double-buckle fasteners and a nylon locking snow collar to help protect feet from the elements. With an EVA midsole and molded rubber outsoles that ensure traction on slippery surfaces. Black or White. Women's whole sizes 6-11; sizes run small, order next size up.