As an outer layer or a mid-layer, the Patagonia Men’s Nano Puff Jacket offers versatile insulation. For around town, as a belay parka, under a shell for skiing, or to bring along as a just in case jacket, the Nano Puff features highly compressible, low bulk PrimaLoft ONE insulation that traps body heat with impressive efficiency, even when wet. The 100% recycled polyester shell blocks wind, sheds moisture, and slides smoothly between layers. The elasticized cuffs and adjustable drawcord hem seal the warmth in, and when you want to let some out, you can easily adjust your ventilation with the full length front zipper of this Patagonia men’s puffy jacket. And when put to use out on the river, this jacket features an embroidered Patagonia Trout logo on the back for some added fly fishing style. PrimaLoft ONE insulation – lightweight, highly compressible, low bulk, hydrophobic, highly efficient even when wet Brick quilting stabilizes insulation with abrasion resistant thread 100% recycled polyester shell – smooth, windproof, DWR (durable water repellant) finish Full front zipper with storm flap and zipper garage Elasticized cuffs, drawcordadjustable hem with drop tail Zippered internal chest pocket doubles as stuff sack for the jacket, with carabineer clip in loop .