Whether you're out on the hiking trail, at the beach, or on a run, the Arc Graphene Tech Long Sleeve will keep the sun off without causing you to overheat. UPF 50+ sun protection and 89% polyester make this long sleeve ideal for keeping you safe from harmful UV rays, and fast-drying in the event it gets wet (or sweaty). Spyder's lightweight, stretch knit EXO THERMO Graphene technology distributes body temperature throughout the shirt; eliminating hot spots and avoiding overheating, so you don't have to sacrifice sun protection for comfort.