Weather Rating: EXTREME COLD The world's warmest, lightest thermal product. Patented fabric technology provides maximum warmth without excessive weight or bulk....more info

Ideal for all types of cool weather activities. This product is constructed with 100% micro denier polyester allowing moisture generated from your body to pass...more info

La Montaña fleece is the ultimate in performance warmwear. With our highest warmth rating (10) it removes any doubt for those concerned with staying warm....more info

It's a question as old as the Appalachian range; boxers or briefs Comfort and moisture management where you need it most. Perfect under a pair of Backcountry...more info

Weather Rating: VERY COLD Deluxe extra heavyweight rachel knit thermal of 50% Cotton/50% Polyester traps and retains body heat for maximum warmth. Originally developed...more info

Authentic 2-Layer Originals Midweight Thermals are constructed with the same insulating Duofold 2-layer technology in a slightly lighter weight. The Authentic Originals...more info

2-Layer Temperature Regulation Base Layer combines a Merino Wool and Polyester Blend outer layer with a soft next-to-the-skin fine denier polyester EC2® Qwik-DriTM...more info

The “original” Hot Chillys in the can enters its third generation with 56% MTF Micro denier polyester, 35% Bio-Silver® polyester intimately blended...more info

MTF3000 has a soft, lived-in cotton like feel made of 92% polyester and with just enough Lycra to retain its shape. It can be washed and worn over and over and...more info

Weather Rating: COLD New! Ideal Weight - All Cotton patented CHEMICAL FREE shrinkage control. 6 ounce waffle knit traps and retains body heat for warmth. Reinforced...more info