"What Our Gearhead® Experts Are Saying: ""This shirt is my go-to for hot summer approaches and alpine linkups. It’s even lighter than the original Astroman and has a ton of airflow. I wear it climbing, hiking, and even around town because it looks clean but performs like a tech layer.""When the heat’s on but the day’s just getting started, we turn to the Outdoor Research Astroman Air Short-Sleeve Shirt. Engineered for active use in hot, exposed environments, it offers the airflow and freedom of movement we need to stay cool and comfortable on the move. Made with ultralight, stretchy recycled nylon, this shirt delivers UPF 30+ sun protection and built-in breathability with strategically placed mesh panels. Whether we’re scrambling on alpine ridgelines or sweating through desert trails, the Astroman Air keeps us cool without sacrificing coverage or style."