"The AFTCO Dorsal Short-Sleeve Button-Down Shirt for Men comes equipped with built-in AFBLOCK UPF 50 sun protection to shield your skin from the sun's damaging rays. It also features AFGUARD durable water-resistant (DWR) stain resistance and is made using AFLITE ultralight fabric for less restrictions and more comfort. This men's shirt from AFTCO boasts vertical vents on the ""dorsal"" side and an integrated lens cleaner for your sunglasses and eyeglasses. Made of 100% polyester. Machine wash. Imported.Manufacturer style #: M45326. 100% polyester AFLITE ultralight fabric offers some stretch AFBLOCK UPF 50 sun protection AFGUARD (DWR) stain resistance Vertical vents at sides"