Muck Boot Arctic Excursion Mid-Height Full Rubber Men's Winter Boot Synthetic Rubber sole Shaft measures approximately 11" from arch Boot opening measures approximately 14" around 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 Full rubber exterior provides additional tough waterproof barrier; mid cut is perfect for cold days when snow is accumulating and slush/puddles are present 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; Lace-up style for snug fit