Upper: Tall height, stylish leather and nylon upper with locking snow collar to protect from the elements, Low-impact and environmentally sustainable B-Tek Eco materials, Double buckle fastening for added security. Base: Arctic Rubber shell to provide lightweight flexibility, cold-resistance and resilience, EVA midsole for lightweight insulation and cushioning, Polar Rubber outsole for maximized grip and longevity of boot at cold temperatures. Removable Comfort-Fit multi-layer inner boot system featuring: Thermaplush soft, wicking layer for warmth, Form-fitting B-Tek Foam lining for comfort, Double B-Tek Heat lightweight, 4-channel hollow-fibre insulation for high-loft breathability in a broad range of temperatures. Vapourized Aluminum Membrane for energy reflection and heat regulation, PolyWool polyester wool blend for breathable warmth, Hydromax layering for improved moisture management, DiamondNet insulation for wind-resistant protection with a lightweight feel. Waffle-comb footbed designed to trap warm air and control odour, Double Aluminum insole returns heat and reflects cold for temperature regulation. Boots rated for polar conditions as low as -148 degrees.