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The Astroman Long Sleeve Sun Shirt is our best-selling lightweight, technical sun shirt, built with AirVent technology and offering UPF protection and movement-mirroring stretch for all your adventures.
Outdoor Research® gear is guaranteed to perform throughout the lifetime of the product.
Free shipping on orders $99+! Need it by the holidays? See our shipping page for all deadlines. Plus, extended returns through 1/31/25. Final sale items are not eligible for return.
Named after the legendary route in Yosemite Valley, the Astroman L/S Sun Shirt features our best-selling lightweight, stretchy, and durable Astroman fabric for long days on the wall, hiking, paddling, and backpacking.
AirVent technology on the back yoke allows superb airflow and breathability, and built-in UPF 30-50+ sun protection protects skin from harmful UV rays. The Astroman's lightweight, quick-drying fabric is soft next to the skin and delivers the durability required for active outdoor pursuits.
For sunny day outdoor activities where staying shaded and cool is critical, the Astroman L/S Sun Shirt is an elite performance top.
*All sizing is based on your body measurement.We adjust the garment for intended fit and intended use.
Classic fit for comfort and ease of movement.
Form fitting base layers worn under other garments.
Close-cut apparel that moves with the wearer.
A traditional fit for comfort in both technical and casual apparel.
