The Men's Patagonia Nano Puff Jacket is a packable jacket for climbing and hiking during cold, wet weather. Built with a 100% recycled polyester shell and lining, the lightweight fabric is abrasion-resistant, while the interior is packed with 60g PrimaLoft Gold Insulation Eco for warmth. Lightweight when packed up, warm when worn, and versatile for midlayer or standalone use.