Patagonia Mens Nano Puff Vest size Medium M / color Slate Gray Warm, windproof, water-resistant—the Nano Puff Vest uses incredibly lightweight and highly compressible 60-g PrimaLoft Gold Insulation Eco 100% postconsumer recycled polyester with P.U.R.E (Produced Using Reduced Emissions) technology, wrapped in a 100% recycled polyester shell and lining. Made in a Fair Trade Certified factory. Excellent preowned condition with no stains, holes, or other issues *See photos for measurements