Warn, windproof, water-resistant.  The Nano Puff Jacket uses incredibly lightweight and highly compressible 60-g Primaloft® Golf Insulation Eco with 100% postconsumer recycled content, wrapped in a 100% recycled polyester shell and llining. Specs Fabric: 100% recycled polyester shell with a brick quilting patter to stabilize insulation. Fit:  Runs true to size .