The Patagonia Men's Capilene Lightweight Crew is Patagonia's lightest-weight, fastest-drying and best-wicking polyester baselayer with Polygiene® permanent odor control.  Run in it, surf in it or layer it with a shell. Capilene® Lightweight is Patagonia's 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 100% recycled polyester is treated with Polygiene® permanent odor control. Features include a self-fabric collar with internal neck tape for chafe-free comfort, full underarm gussets for unhindered shoulder mobility, elastic thumb loops for secure hand coverage, flatlock seams to minimize chafing, offset shoulder and side seams to lie smoothly beneath pack straps, and a drop tail for additional coverage. Fair Trade Certified™ sewing. Features and Specifications Capilene® Lightweight has a smooth face for easy layering with Polygiene® permanent odor control. Fair Trade Certified™ sewing 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 Elastic thumb loops for secure hand coverage Flatlock seams to minimize chafing; drop tail for more coverage 2.3-oz (80-g) 100% recycled polyester double knit with Polygiene® permanent odor control. Fair Trade Certified™ sewing. Fabric is bluesign® approved 99 grams Patagonia Men's Capilene Lightweight Crew Long Sleeve Thermal Top - Thermal Underwear