Patagonia M's Nano-Air Light Jkt

A light, highly elastic insulated jacket with breathable synthetic fiber filling, designed for intense stop-and-go activities in the mountains.

Patagonia's M's Nano-Air Light Jacket is designed so you won't waste any more time changing layers during intense stop-and-go activities in the mountains. This light insulated jacket moves with you and regulates your body temperature: FullRange insulation quickly releases excess heat during intense exertion and keeps you warm during rest periods.

The outer and interior materials are made from 100% recycled polyester ripstop—abrasion-resistant, breathable, and pleasantly soft against the skin. A durable water-repellent impregnation allows light moisture to bead up and roll off.

The design is tailored for alpine activity: The front zip features a soft chin guard, and the two hand-warmer pockets and chest pocket are flat-seamed so they don’t dig in, even under a climbing harness or hip belt. If it gets too warm, you can stow the jacket completely in the left chest pocket; narrow, elastic cuffs fit snugly and can be pushed up over the forearms.

This makes the Nano-Air Light Jacket an insulated jacket for mountaineers who want to stay light, mobile, and comfortable while maintaining a balanced body temperature.