Muck Boot Arctic Sport Ll Extreme Conditions Mid-Height Rubber Women's Winter Boot Neoprene 5 mm neoprene provides comfort and flexibility, along with excellent waterproofing, shock absorption and heat retention properties; adjusts to the contours of your foot to resist blisters and chafing High-grade extended rubber exterior provides extra toughness and makes for a 100% waterproof winter boot; pull tab for easy on/off Fleece lining is soft for enhanced comfort, durable for long wear, and provides exceptional warmth in frigid environments; comfort rated from -40 F to 40 F (-40C to 4C) Womens last is specially designed to support the female foot; 10-inch height protects shins while allowing freedom of movement Comfort insole supports and cushions feet; slip-resistant, rugged outsole offers durability and traction on slick surfaces