Not too often do you control your own insulation — without a serious workout regimen/diet — but with the Klymit 2013 Double Diamond it's as simple as blowing hot air, or rather air that keeps you warm. The 2009 Popular Science Best of What's New award winner has updated its design for a more streamlined style that better layers into your ski garb or holiday shopping outfit, maintaining the NobleTek Gas Insulation system that garnered all that praise and attention.
This Sport Takes Ice Skating to Extreme Heights
These are ultralight, utilizing argon as its insulation, the level of which adjusted by connecting a small, portable canister to a valve in the pocket and then filling up, effectively lining you with a layer of down or synthetic fibers. Because argon is practically weightless, the 15-ounce four-way stretch ultra wicking liner won't weigh you down. The new models come with dry air pumps which use the air readily available around you instead of argon, still making for a double-paned window-like insulation wherever you go.