Bienvenu UV UPF 50+ Protection Outdoor Multifunctional Flap Cap with Removable Sun Shield and Mask Material: polyester. 360 degrees full protective jungle cap, UPF 50 +, suitable for: mountaineering/biking/travelling/camping. There are breathable mesh around both sides of crown, assure timely head heat discharge, the hat with quick-drying taslon fabric, sun protection performance achieved UPF 50+, isolate the ultraviolet ray completely, prevent sunburn. Adjustable cap, hat behind have adjustment button, can be adjusted according to different type head and head circumference size. Breathable mesh design, hats full face mask mouth position with breathable mesh patchwork design, convenient breathe easier when the great physiological load of exercise. The inside line of the hat flat, stitch uniformity, quality very good.