The Nano-Air® Light Vest was made to be worn for the entirety of your aerobic, start-stop mountain activities, so you’re never slowed down by having to change layers. Stretchy and breathable FullRange® insulation dumps excess heat when you’re working hard and keeps you warm when you’re not. The Men's Nano-Air® Light Vest is fully backed by our Ironclad Guarantee and you can find it on Patagonia.com. | Patagonia Men's Nano-Air® Light Bottoms - Midlayer Vest in Tidal Teal, XXL - Down & Synthetic Vests - Polyester