Patagonia Men's Airshed Pullover

Patagonia says:
The Airshed became an instant favorite among our endurance testers for its on-the-go breathability and wind buffering-it inhabits the sweet spot between baselayer and light shell. Born of discoveries from our revolutionary Nano-Air(R), the Airshed uses a soft, stretchy, whisper-light 100% nylon mechanical-stretch ripstop fabric that helps create a highly breathable and fast-drying microclimate, whether worn over a thin tee or more insulative underlayers. The quarter-zip allows for venting, a zippered chest pocket doubles as a stuffsack (with reinforced carabiner clip-in loop) and the stretch-knit cuffs and hem seal out weather and maintain comfort. With reflective logo on left chest and center-back neck, and a DWR (durable water repellent) finish.