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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.
100% 30D Recycled Nylon
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.
UPF 50+ Protection
Chest Pocket
Stows Away in Chest Pocket