• Recycled polyester/spandex wicks sweat and dries quickly • Fabric has a soft and silky feel for next-to-skin comfort • UPF 50+ sun protection • Underarm gussets ensure you can reach and move with ease • Shaped shirttail hem stays tucked when you stretch • Locker loop for hang-drying • Weight (size S): 5.7 oz. • Machine-wash warm; wash separately; do not use bleach or fabric softeners; tumble dry low and remove promptly • Made in a Fair Trade Certified ™ factory • REI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world