These taller crew height thick hunting socks make excellent mountaineering socks. Extra thick socks provide warmth for cold weather outings, as well as lots of cushion to help pad and protect your feet when traveling in difficult mountainous terrain or carrying a heavy pack. Thick socks like these also help make your boots fit and feel better by filling in the voids where you need to in order to customize the fit of your boots. These also make great extreme cold weather backcountry ski and snowboard socks too, as long as your boots have been sized accordingly to accommodate thick warm socks like these. Smartwool's warmest socks!