SIZE: Large - X-large best fits for 23.6"-24.8",60-63cm ;X-Large - XX-Large best fits for 24.8"-26",63-66cm. has an elasticized locking draw cord at back to adjust for head size. Great Ventilation - Mesh Crown & 4 Eyelets keep your head cool.The outdoor sun hat can flop down the brim to be a boonie hat; button brim up to be a stylish cowboy hat. Packable & Lightweight: Crushable fabric can easily be packed for travel,could even be tucked into your POCKETS.Great for beach, pool, fishing, hiking, camping, walking, hunting, gardening or any outdoor sports and activities. UPF 50+ Sun Protection: 3 inches wide brimmed hat could Block 97.5% of the sun's harmful ultraviolet rays.Our fabric is rated at an unbeatable UPF 50+ (Ultraviolet Protection Factor).These boonie hats are perfect for people who are engaged in outdoor recreation such as fishing, hunting, camping, hiking and many more. With this hat, you can spend more hours in your garden cutting the grass. This time, don't be afraid of the sun and enjoy nature. WASHING INSTRUCTION - hand wash with cool water, air dry; or spot clean.