Removable Comfort-Fit multi-layer inner boot system; B-Tek Heat lightweight, 4-channel hollow-fibre insulation for high-loft breathability in a broad range of temperatures; Thermaplush soft, next-to-foot wicking layer for warmth; B-Tek Dry Waterproof Base; Double-weave, 900 Denier nylon upper; Nylon snow collar to protect from the elements; Double buckle fastening for added security; Arctic Rubber shell to provide lightweight flexibility, cold-resistance and resilience; EVA midsole for light-weight insulation and cushioning; Polar Rubber outsole for maximized grip and longevity of boot at cold temperatures