The Batteries make the difference. Put on a pair of MPI Outdoor HEAT SOX , before you put on your boots, and they will provide safe heat to...more info

Combat Boot Thorlos are specially designed for use in military boots. High-density padding at the heel, ball, and toes provides extra protection...more info

A fully cushioned thermal boot sock, which includes a extra-smooth reverso toe closure....more info

This flat knit sock provides a close, lightweight fit that acts like an adventurer's second skin to minimize friction and blisters. Use with...more info

Ultra soft Merino Wool Boot Sock with an integrated Olefin liner for the ultimate in dry-lined comfort. Because the liner is fully integrated...more info

This is Smartwool's most heavy-duty outdoor sock. When you're going to extremes like mountaineering, ice climbing and long backpacking treks,...more info

The A.T. Boot Plus is a 3-4-season sock combining the thermal and comfort properties of soft Merino Wool with the moisture transport properties...more info

Versa 2-Way Mid Fleece Sock Features • Perfect everyday casual sock for all-weather comfort • Great for work, sports, and recreation...more info

Smartwool's Target Use: This full cushion sock is great for hiking, fast packing or peak bagging, along with any type cold weather training...more info