Removable Tri-Fit multi-layer inner boot system; Polywick lining for moisture transfer and evaporation outside of fabric; Polywick lining for moisture transfer and evaporation outside of fabric; Vapourized Aluminum Membrane for energy reflection and heat regulation; B-Tek Dry Waterproof; Fully moulded, Polar Rubber upper for cold-climate performance; Nylon snow collar to protect from the elements; Fully moulded, Polar Rubber outsole for maximized grip and longevity of boot at cold temperatures