"The Montana is part of the Naot Outdoor Collection. This waterproof upper calf snow boot is perfect for even the coldest winter days with a 4 layer weather tech lining that is rated -20C/-4F. The slip resistant rubber sole features an innovative on/off OC Grip System with stainless steel studs allowing you to walk comfortably on icy surfaces. The Montana features Naot's removable anatomic cork and latex footbed and a side zipper for accessibility.