4 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 is curved to improve range of motion, and snugs calf to seal in warmth while keeping cold and debris out Breathable Airmesh lining wicks away humidity and perspiration, and allows air to travel throughout the boot; comfort rated from subfreezing to 65 °F/18 °C High-traction rubber outsole delivers sure footing in mud, slush or rain High-grade extended rubber exterior provides extra toughness and makes for a 100% waterproof garden shoe; easy on-off with pull-on tab