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 | High-grade extended rubber exterior provides additional tough waterproof barrier; low cut is perfect for cold days when the snow is not too deep but the conditions are muddy, slushy or wet | Fleece lining is soft, durable and provides exceptional warmth in frigid environments; etc Sockliner reduces underfoot friction and heat build-up; comfort rated from -40 °F to 40 °F (-40 °C to 4 °C) | EVA midsole for lightweight support and cushioning; rubber pod EVA outsole grips for better traction on ice and rain-slick surfaces | 100% waterproof winter boots; Rear pull tabs for easy on/off (7539)