SUN PROTECTION & WIDE BRIM - The booney hat's sun protective rating is up to UPF 50+. The fabrics which adopt professional sunscreen technology can effectively shield more than 99% of UV rays. This safari hat can effectively protect your face and neck from harmful rays in summer with 3.74 inch enlarged wide brim BREATHABLE & COOLING - The hiking hat's lining is made of cotton and polyester, with vented mesh windows on both sides. The breathable sunhat can keep your head ventilated and cool all the time. Furthermore, the built-in moisture wicking headband maintains the hat's breathability and sweat absorption, which keeps you cool without being stuffy ADJUSTABLE & FITTING - This boonie cap is designed with elastic draw straps, which can fit the head circumference of men and women of 22-23.2 inches7 3/8. The chin string is adjustable which can be easily fixed to keep the sunhat well on your head even on windy days WATERPROOF & QUICK DRYING - The fabric of the fishermen's hat is made of 100% ripstop nylon material, with a water-repellent design, which can prevent rainwater getting into your hair. The big brim can block the rain in a large area and keep the face from getting wet. Quick drying washable material makes it more practical to use on rainy days FOLDABLE & LIGHTWEIGHT - Our packable bucket hat weighs only 100g, and can be folded in half and easily put into the bag. It's a great collapsible hat for daily use and outdoor activities, especially fishing, boating, hunting, camping, outing, hiking, riding and gardening