What Our Gearhead® Experts Are Saying: "This is the shirt I grab for everything from exposed summit pushes to long travel days. It’s breathable, stretchy, and the UPF 50+ makes it perfect for sun-drenched hikes. I also love that it doesn’t retain odor after a few wears." When we’re headed out for a long day under the sun or planning a weekend full of movement, the Mammut Selun FL Long-Sleeve Logo shirt is what we reach for. Built for active comfort, this top uses a soft, quick-drying stretch fabric that moves with us, whether we're hiking through ridgelines or layering up for cool morning starts. The relaxed fit and offset seams reduce chafing, even under a pack, while the bluesign® approved, solution-dyed recycled polyester keeps the environmental impact low. With UPF 50+ sun protection and a silver-free anti-odor finish, the Selun delivers all-day performance without compromising comfort—or the planet.