Arc'teryx Ossa Overshirt - Men's

The Arc'teryx Ossa Overshirt is a button-up sun layer built for high-exposure hikes — UPF 50+, textured nylon ripstop that breathes and resists skin-sticking on sweaty climbs, and a pop-up collar that keeps the back of your neck covered when the sun is relentless. Easy to throw over a tee, it packs into its own chest pocket and looks clean enough to wear off the trail too.