Sometimes shiver-proof protection comes in small packages—like the Patagonia Men's Nano Puff Vest. This warm, water-resistant, and windproof vest features lightweight Primaloft® Gold Insulation Eco with postconsumer recycled content wrapped in a moisture-shedding recycled polyester ripstop shell with a DWR (durable water repellent) finish. The vest boasts a regular fit and a soft, wicking interior storm flap and zipper garage for chin comfort. Other fine points include an adjustable drawcord hem, a pair of zippered handwarmer pockets, and an internal chest pocket (with clip-in loop) that doubles as a stuff sack. Incredibly lightweight and packable, the Nano Puff® Vest is an ideal cool-weather travel companion, whether you're keeping it simple over a shirt or layering it under a shell.