Features a built-in gaiter on top to seal out the elements. Thicker shaft than most rubber boots for increased durability while still allowing for flexibility to make maneuvering easy. Removable 8-layer inner lining provides a lightweight feel, thermal insulation, and moisture management. Locking snow collar for deep snow protection. EVA and Thermatufâ” insole provides excellent support, comfort and all-day warmth. Polar Rubber outsole has an aggressive lug pattern delivers superior traction and flexibility. Comfort rated from -148Â°F/-100Â°C to keep your feet warm in the winter months.