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; Form-fitting B-Tek Foam lining for comfort; Vaporized Aluminum Membrane for energy reflection and heat regulation; PolyWool polyester wool blend for breathable warmth; Hydromax layering for improved moisture management; 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