With the Nation Pro from Kamik, winter can be as cold as it wants - your feet will stay comfortably warm even in deep sub-zero temperatures down to -40°C. The robust and waterproof rubber sole combined with the waterproof leather creates the perfect combination for unpleasant winter weather. Dri-Defence is a specially developed membrane - a bootie - that is suspended like a sock between the lining and the outer material. It makes the product waterproof, transports moisture to the outside, and simultaneously prevents moisture from entering the boot. 3M Thinsulate, developed by 3M, offers this innovative microfiber insulation with a large surface area that reflects body heat. Additionally, it provides twice the warmth of down or polyester insulation at the same thickness. Size information: size fits true to size, fit: normal.