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 Highgrade extended rubber exterior provides extra toughness and makes for a 100 waterproof winter boot pull tab for easy onoff 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 16inch height offers maximum protection from the elements Comfort insole supports and cushions feet slipresistant rugged outsole offers durability and traction on slick surfaces