Tall height, nylon and leather upper with locking snow collar; Built-in waterproof gaiter with Velcro enclosure to protect from the elements; Lace up removable inner boot system for improved fit and secure comfort; 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; Reinforced steel 3-pin toe for cross country ski compatibility; Thermawick comfortable, hi-wick next-to-foot lining material for greater breathability and improved thermal regulation; Form-fitting B-Tek Foam lining for comfort; B-Tek Lite proprietary aero-insulation blend that allows the inner boot to achieve greater thermal regulation while using less material