Nylon upper insulation for wind-resistant protection with a lightweight feel; Side-to-side lace fastening system with drawstring and toggle; Nylon locking snow collar to protect from the elements; 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; Removable Comfort-Fit multi-layer inner boot system; Thermaplush soft, next-to-foot 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