What Our Gearhead® Experts Are Saying:"This is my go-to shirt for summer hikes and long travel days. The Astroman Short-Sleeve Sun Shirt feels cool and breathable in the heat, and the stretch makes it super comfortable under a pack. The hidden snap closure and zip pocket are a nice bonus for keeping it streamlined."When the trail heats up or the journey takes us off-grid, we reach for the Outdoor Research Astroman Short-Sleeve Sun Shirt. Designed for movement in the heat and built to go wherever we do, it combines lightweight, breathable stretch fabric with UPF 30+ sun protection to keep us cool, covered, and ready for anything. Updated with a hidden snap-front closure and a low-profile zippered chest pocket, this tech shirt delivers functional storage without added bulk. The relaxed fit and bluesign®-approved materials offer sustainable comfort from desert hikes to daily wear. Whether we’re navigating switchbacks or train stations, the Astroman keeps pace with our every move.