A classic, all-around polyester baselayer with 100% recycled content. The smooth, soft face makes for easy layering. Hollow-core yarns and a diamond-grid back trap warm air, wick moisture and dry fast. HeiQA(R) Fresh durable odor control keeps things fresh Specs & Features Patagonia&';s most versatile baselayer Smooth, soft face makes for easy layering, and HeiQA(R) Fresh durable odor control keeps things fresh Soft, brushed, fast-drying elastic for added next-to-skin comfort; locker loop for hang drying Fabric&&';;s diamond-grid pattern next to skin provides superior warmth, breathability and moisture-wicking performance Gusseted crotch for comfort and unimpeded mobility Functional fly and flatlock seams to minimize chafing Stretch for added comfort and improved fit during movement Fair Trade Certified(TM) sewn Country of Origin: Made in Sri Lanka Weight 164 g (5.8 oz) Materials 5.1-oz (147-g) 100% recycled polyester diamond-grid double knit with HeiQA(R) Fresh durable odor control and 50+ UPF sun protection Fabric is certified as bluesignA(R) approved Fair Trade Certified(TM) sewn