evo.com | Outdoor Research Activewear Tees > Named for the legendary Yosemite testpiece, the Outdoor Research Astroman Air Short Sleeve Sun Shirt earns the reference with laser-perforated ventilation, bluesign(R) approved recycled stretch nylon, and UPF 30 protection for long days on rock or trail in full sun. Regular Fit Center Back Length 73.7cm / 29.0in UPF 30 bluesign(R) approved 85% Recycled Nylon / 15% Spandex Hidden Snap Front Closure | Outdoor Research Astroman Air Short Sleeve Sun Shirt Men's 2027 - Medium Black | Nylon/Spandex