5 mm neoprene provides comfort and flexibility, along with excellent waterproofing, shock absorption and heat retention properties; adjusts to your foot shape to resist blisters and chafing Stretch-fit Comfort Topline snugs calf to keep out cold and debris, but can be rolled down from high to mid for warmer weather; calf-high rubber overlay protects ankles from sticks, rocks etc. Breathable Airmesh lining wicks away humidity and perspiration, and allows air to travel throughout the boot while keeping water out; comfort rated from -20 °F to 50 °F (-30 °C to 10 °C) Lightweight EVA midsole for additional cushioning; self-cleaning MS-1 ribbed outsole wraps perimeter for maximum stability and performance in mud and snow High-grade rubber provides extra toughness and makes for a 100% waterproof field boot; wrap-up toe bumper for extra toe protection