Patagonia Capilene® Lightweight is the 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 with 35-UPF sun protection and is treated with Polygiene® permanent odor control. Features include a brushed elastic waistband for next-to-skin comfort, a gusseted crotch for mobility, flatlock seams to minimize chafing and a fully functional fly. Fair Trade Certified™ sewing.