evo.com | Arc'teryx Activewear Tees > 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. UPF 50+ Protection Chest Pocket Relaxed Fit This fit is cut loosely through the chest, waist, hip, and thigh. Relaxed without sacrificing structure and clean lines, it offers comfort and freedom of movement with a more casual look. Stows Away in Chest Pocket 100% 30D Recycled Nylon | Arc'teryx Ossa Overshirt Men's 2026 - Large Khaki | Nylon