Outdoor Sun Protection Hat Folding Neck Flap Cap with Removable Shield and Mask 100% Polyester High quality Waterproof Quick-drying fabric, Mesh, absorb sweat, breathable, UV resistance. Breathable mesh mask, help breath easily and avoid dust enter into mouth. Multi-function hat with 360 degree full protect you from sunburn and mosquito. Remove cap shade can become fashion baseball cap. One size fits 21.7"-24.4" head girth with adjustable velcro and chin strap.