Patagonia Men's Capilene Lightweight T-Shirt is their lightest-weight, fastest-drying and best-wicking baselayer. The fabric's subtle grid pattern sits lightly and comfortably on the skin; the smooth outer face glides easily in any layering system. Highly breathable for high-exertion and warm conditions, the fabric is bluesign approved, 100% recycled polyester with 35-UPF sun protection and is treated with Polygiene permanent odor control.Features:Capilene Lightweight has a smooth face for easy layering Fabric's open grid pattern next to skin provides excellent breathability, moisture-wicking and dry time Self-fabric crew at collar with internal neck tape for comfort Locker loop for hang-drying Offset shoulder seams eliminate chafing under pack straps Full underarm gusset for range of motion and chafe-free comfort Flatlock seams to minimize chafing; drop tail for more coverage