When out hiking, fishing or climbing in cold conditions, you want to stay warm, of course. But, the trick is: you don't want to be too warm. Or too wet from your own sweat. That's the beauty of Patagonia's Capilene Baselayers. They'll keep you warm and they'll wick moisture away from your skin. And they'll dry fast when you're at base camp, uh, "airing out." Capilene is machine washable, and at least 50% of the fabric is made with recycled polyester. (Who knew that wearing long underwear could be goo... FULL REVIEW

Comfort is the driving factor behind this "Best Of" thermal underwear selection. It begins with a zip T-neck for an easy on and off, plus it helps you ventilate. Marmot's Silver DriClime material is lightweight and durable. Woven into the material is BacteriaStat Permanent Odor Conrol which prevents stinky bacteria from growing in the material, something you and your tent mates will appreciate. No side seams and no tag in the neck will add to your comfort. You can order a men's or women's version, ea... FULL REVIEW

The Filson Company traces it roots back to 1897 when company founder, C.C. Filson, ran a store in Seattle uniquely situated to serve the throngs of adventurers and dreamers headed north to stake their claim in the Great Klondike Gold Rush. Since then, the company says, it has continued to make outdoor products that aim for maximum comfort, protection and durability, which is just what one hopes for in thermal underwear. This "Best Of" choice is made from 100% virgin Merino wool. Don't worry, there's ... FULL REVIEW