Patagonia Nano‑Air Light Vest is a lightweight insulating vest designed for high-output mountain activities. It delivers breathable, stretch insulation that sheds excess heat while keeping the core warm during start‑stop efforts. Key attributes: Green | Polyester ripstop | Highly breathable | Lightweight insulation | Durable water-repellent finish to resist light moisture | Stretch fabric for improved range of motion | Center-front zipper | Two zippered handwarmer pockets | Zippered left-chest pocket | Self-stuffs into chest pocket | Low-profile quilting | Articulated patterning for mobility | Cleanly finished armholes and hem | Zipper garage at chin | Dimensions & fit: Regular fit | Composition & care: Shell and lining: 100% polyester | Insulation: 40 g FullRange® 100% polyester | Machine wash cold. Do not bleach. Tumble dry low. Do not iron.