100% Waterproof  5mm CR Flex-foam - moulds to the shape of your foot  Breathable air mesh lining   2mm Thermal Foam under foot bed  Durable, quick cleaning outsole  Estimated boot height 43cm/ 17.3" Estimated max calf circumference 43cm/17.3" Half Sizes order up  Outsole designed for optimum use on soft, wet or loose ground Muck Boots Muckmaster Tall Boot