5 mm neoprene provides comfort and flexibility, along with excellent waterproofing, shock absorption and heat retention properties; adjusts to the shape of your feet to resist blisters and chafing Fleece lining is soft for enhanced comfort, durable for long wear, and provides exceptional warmth in frigid environments; comfort rated from -20 °F to 50 °F (-30 °C to 10 °C) Lightweight EVA midsole for additional cushioning, support and impact resistance all day long; pull tab for easy on/off Achilles reinforcement offers additional support for extended wear; 11-inch height offers good flexibility and protection High-grade rubber exterior provides extra toughness and makes for a 100% waterproof winter boot; lightweight, high-grip rubber outsole provides traction on slick surfaces