Maybe the sun's shining or maybe the mercury's dropping, but either way you'll dig the lightweight and breathable warmth of the Patagonia Nano Air Men's Insulated Vest. It's designed for aerobic stop and go activities climbing, skiing, alpine adventures. It sports a stretchy nylon ripstop shell, tough nylon lining, and super flexible FullRange synthetic insulation. You'll be able to flow through the mountains like water, while the DWR coating prevents moisture from creeping in, and the insulation supplies a super breathable layer that'll help you stay even drier. Two dual adjustable hem drawcords keep heat from sneaking out the bottom, and the low profile pockets keep your fingers warm and your phone safe.