The Patagonia Nano Puff Jacket is a hoodless jacket for lightweight warmth on the trail, in the mountains, and on the town. A versatile, windproof piece that adds heat to your upper body, it can be worn alone or layered appropriately. The 60g PrimaLoft Gold Insulation Eco is recycled, incredibly light, and pairs well with an active adventure. If the forecast indicates rain or snow, add a shell to stay dry and toasty.