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 like 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.