What Our Gearhead® Experts Are Saying:"The Astroman Air Short-Sleeve Shirt is my go-to for brutally hot trail days. It’s lightweight, super breathable, and the laser-cut vent panels actually make a difference. I love the updated snap front—clean look, easy to wear, and built for movement."We push hard when the heat is up, and the Outdoor Research Astroman Air Short-Sleeve Shirt keeps us cool through every mile. Engineered with laser-perforated vents in key zones, it sheds heat efficiently while protecting us with UPF 30+ sun coverage. Whether we’re grinding up desert trails or moving fast in alpine sun, this shirt stays breathable, light, and ready to move. The bluesign®-approved recycled nylon fabric stretches with us and dries fast, while the updated design includes a hidden snap-front closure and a zip chest pocket for low-profile storage. Movement-mirroring construction ensures comfort under a pack or harness, making this shirt a summer essential for high-output adventures in exposed terrain.