The heathered prAna Calder LS is made from quick-drying stretch fabric that's UPF rated for sun protection. If you're looking for extra protection in the water or on the beach, look no further. FEATURESLong Sleeve Sun Top Melange performance stretch jersey Natural quick dry properties Logo Screen-print detail UPF 50+ rated Standard fit 86 Polyester / 14 Spandex