Patagonia Women's Micro Puff Jacket - Thermal BlueA principal Patagonia design these days, is their innovative synthetic insulation, beloved by ultralight hiking fraternity, climbers, bikepackers and all weight conscious outdoor doers. Utilising ultralight, windproof Pertex nylon ripstop, the Micro Puff Hoody is constructed with their innovative quilting design which stabilises and maximises loft whilst minimising stitching. PlumaFill synthetic insulation still works to keep you warm, even when damp.