This ultra-light, ultra-soft, ultra-comfortable jacket is out to prove that heavier isn't always warmer.Think you'll get cold in a lightweight jacket Go ahead. Try this jacket on. Don't say we didn't warn you, but if it's summer or unusually warm, make sure the air conditioner is cranked up. That's right, Patagonia's Micro Puff Hooded Jacket will change your opinion about wearing heavy layers to stay warm. By combining their PlumaFill synthetic insulation with unique Micro Puff construction, Patagonia may have found the perfect wamth-to-weight ratio. As a bonus, it resists wind, rain and light snow as well. 100% nylon shell and lining. 100% polyester (65g) insulation. Imported.Feels Like DownPlumaFill is a revolutionary, featherlight polyester down alternative that replicates the structure of down. This continuous synthetic insulation uses a central fiber surrounded by fluffy microfilaments that not only feels like down, it traps heat like down. Even better—unlike down—it still traps your heat if it gets wet and never shifts or clumps. That means no cold spots for the life of the jacket. It's not only resilient, but it retains its loft retention after washing. Plus, it's extremely packable. (More on that below.)Resists Wind & WaterThe Micro Puff Hooded Jacket features a tightly woven fabric (10-denier) shell and lining of ultralight (0.7oz.) nylon ripstop Pertex Quantum GL. This silky-smooth fabric is water-resistant, windproof and allows the insulation to fully loft and trap still air, thereby improving the efficiency of the insulation. A durable water repellent (DWR) finish is applied to shed light rain and snow and decrease drying time, yet still allow the fabric to breathe for exceptional comfort as your activity, and thus your body heat, increases.Complementary ConstructionThe innovative quilting that gives the Micro Puff Hooded Jacket its unique look also helps stabilize and maximize the loft of the PlumaFill insulation strands. Using minimal stitching also helps reduce the overall weight of the jacket and cuts the potential for cold spots with larger lofted areas.Perfect PackingWith the ability to pack compactly into its own pocket like a sleeping bag in a stuffsack, you'll discover just how handy this jacket can become the next time Mother Nature throws you a curveball.