The Patagonia Nano Puff Vest - Men's is a compressible vest for hiking and casual wear. This lightweight wonder has skipped the sleeves and comes in toasty with 60g PrimaLoft Gold Insulation Eco. The 100% recycled polyester shell is windproof, water-resistant, and slides easily under and over various layers. Centered warmth during fall color hikes, winter excursions, and sitting at the office waiting for the clock to tick past five.