Although it’s only 15 millimeters thick when fully blown up, Klymit’s new inflatable vest is equivalent in warmth to puffy, 300-fill synthetic insulation yet it’s as thin as a fleece jacket. Scuba divers have used argon, a dense noble gas, for years to insulate drysuits. Nate Adler, who founded Klymit in Ogden, Utah, saw argon’s potential for winter clothing after a diving trip. Klymit’s vests are inflated via an argon canister. If you get too warm, twist the release valve on the chest and let out some gas. [$225; klymit.com]
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