What Our Gearhead(R) Experts Are Saying:"I wear the Astroman Short-Sleeve Sun Shirt on hot days when I need protection without overheating. It's breathable, stretchy, and the hidden snaps make it super easy to throw on or vent while hiking. The relaxed fit is a nice update-it feels way less restrictive than older versions."When we're spending long days on the trail, at the crag, or deep in the desert, we count on the Outdoor Research Astroman Short-Sleeve Sun Shirt to keep us cool and protected. This lightweight tech shirt is our go-to for breathable comfort under the sun, with UPF 30+ protection and quick-drying performance in a relaxed, movement-friendly fit. Bluesign(R)-approved recycled materials and stretch-infused fabric allow us to move freely, while thoughtful details like the hidden snap front, drop-in chest pocket, and updated back yoke keep it functional and clean. It's a shirt that does everything-hike, climb, and travel-without missing a beat.