Royal Robbins Women's Expedition Chill Stretch Sky Print 3/4 Sleeve Tank Top 100% Polyester Imported Wick-ed Cool mesh in the upper back ventilation panel Wick-ed Cool mesh has ultra-wicking fibers with cooling treatment that actively cools the skin Reinforced barracks at stress points for increased durability and snap front closure Secure roll-up sleeve tabs and zip secured hip pocked UPF 50+ sun protection