The AFTCO Men's Dorsal SS button down shirt comes features a 100% polyester base with AFBLOCK UPF 50 sun protection, AFGUARD stain resistance, and AFLITE ultralight fabric. These shirts come with many extras including vertical vents on the "dorsal" side, as well as a integrated lens cleaner for your sunglasses and eyeglasses. Features100% PolyesterMechanical weft stretch heathered 95 gsmIntegrated lens cleanerUPF 50 sun protectionStain resistanceUltralight fabricDWR stain resistance