Mechanical weft stretch heathered 95 gsm Integrated lens cleaner UPF 50 sun protection Stain resistance The Dorsal short-sleeved button-down shirt boasts a 100% polyester foundation with AFBLOCK UPF 50 sun protection, AFGUARD stain resistance, and AFLITE ultralight fabric. It comes packed with extras like vertical vents on the 'dorsal' side and an integrated lens cleaner for sunglasses and eyeglasses.