This polo shirt works as hard as you do. (Assuming you aren't one to just watch others have all the fun.)Unlike most polo shirts, Patagonia's Cactusflats Polo Shirt has a few tricks up its sleeves. First there's the fabric. No ordinary cotton fabric here. This shirt features a soft, soothing jersey knit blend of polyester, TENCEL lyocell (which offers excellent wicking and moisture-management properties) and spandex. Sporting an antimicrobial, wicking finish and 50+ UPF sun protection, you'll enjoy how this shirt keeps you odor free, dry, comfortable and protected from damaging UV rays. Then there are the details. Set-in sleeves with underarm gussets for mobility. Minimal flat-seam construction for next-to-skin comfort and relief from chafing. A mesh-lined collar helps wick moisture in this key area. There's a locker loop for hanging it up to dry (which it does quickly). And to top it off (yes, pun intended), the Cactusflats Polo Shirt packs down small for easy traveling. 5.4-oz., 84% polyester/12% TENCEL lyocell/4% spandex jersey knit. Imported.TENCELTENCEL is a branded lyocell fiber that comes from the pulp of trees that are grown on sustainably run farms certified by the Forest Stewardship Council (FSC), which is then dissolved in a non-toxic organic solvent. The solvent is recycled in a closed-loop process—more than 99% of the solvent is recovered and reused. Patagonia ensures that the fabric processing of TENCEL lyocell fiber does not utilize any harmful chemicals (like formaldehyde).50+ UPFThe Cactusflats Polo Shirt features a sun protection rating of 50+ UPF (Ultraviolet Protection Factor), which means only 1/50th of the sun's UV rays that fall on the surface will pass through and reach your skin. The sun protection is built-in so, unlike messy sunscreen, it won't wear off or need to be reapplied throughout the day.Key FeaturesSoft, soothing jersey knit blend of polyester, TENCEL lyocell and spandexAntimicrobial for odor-free easy careWicking finish keeps you cool and dry50+ UPF sun protection for all-day wearSet-in sleeves with underarm gussets for range of motionMinimal flat-seam construction prevents chafingLocker loop lets you hang it up to dryMesh-lined collar wicks moisturePacks small easily for travelNo tags at neck for