Already carrying a reputation as Muck Boots\' warmest boot for women the Arctic Sport Mid has been upgraded to allow for even greater warmth and comfort to keep you cosy and relaxed during the winter months. Designed to be durable these boots\' extended rubber exterior are EVA footbed are all focused on achieving maximum comfort and support for your feet as you brave the cold winter outdoors., 5mm CR Flex-Foam., Warm fleece lining., Extended rubber exterior., Comfort insole with dual density., EVA footbed.