All-Day Comfort & Durability – Engineered for performance with a waterproof neoprene upper, molded EVA midsole, and PU footbed for unmatched support. 800g Thinsulate Insulation – Regulates temperature in all seasons, keeping feet warm in cold conditions from -20°F to 40°F. Superior Waterproof Protection – Fully waterproof construction with extra rubber overlays to shield against wet conditions in any terrain. Advanced Traction & Stability – Multi-surface rubber outsole with SITKA Apex Tread System provides secure footing on rugged, slippery, and uneven surfaces. Convenient & Secure Fit – Rubber heel kick pad for easy removal, reinforced toe and heel overlays for durability, and sizing up recommended for best fit.