UPF 50+ Sun Protection Visor enthusiasts will revel in the Sunday Afternoons Aero Visor which provides excellent UPF 50+ protection for your eyes and face while its open crown top maximizes heat dispersal. Engineered with quick-drying polyester fabric and a sweat-wicking sweatband, the Sunday Afternoons Aero Visor will keep you perfectly dry and cool. Exclusive foldable "Clam-shell" brim technology allows for the brim to be folded in half for the best in packability. Approx.3 1/4" Foldable "Clamshell" Bill/Visor Made of:100% Polyester UPF 50+ Sun Protection(Note: this does NOT apply to the top of your head!)bluesign® Certified Quick-dry FabricMoisture Wicking SweatbandAdjustable Sizing StrapFoldable "Clamshell" BillSunglass Lock™ - Keeps Glasses in PlacePackableLightweight 1.6 ozUnisex Size: One Size Fits Most - Use adjustable sizing strap to adjust fit up to size 7 1/2 (XL).