Muck Boot Arctic Excursion Mid-Height Rubber Men's Winter Boot Neoprene Rubber sole Shaft measures approximately 11" from arch Boot opening measures approximately 14" around 100% Waterproof; Comfort range: -40 to 40F The Arctic Excursion Mid is an all-purpose outdoor boot. 5mm CR flex-foam; Warm fleece lining etc Sockliner; Lightweight EVA midsole