UV50 Foldable Sunhat Women Ponytail Hole Safari Beach Fishing Bucket Hat 55-61CM UPF50 Wide Brim: 46%cotton/54%linen spf rated fabric blocks most sun UV rays, 3.9" wide brim provides excellent shade protection for face and neck. Crushable & Packable - you can fold or roll-up it and tuck in away in suitcase, great for cruise, outdoor trip, beach vacation and the like. Also it can regain its shape easily, but sometimes you might need steam/ironing machine to reshape it, you can find the instruction from the product images. Invisible Ponytail Hole - perfect to pull your bun or ponytail through on hot summer days; plus the opening is basically not visible, so it just looks like a regular fashionable sunhat when you don't use the ponyhole. Wired Brim - there is quality wire built in brim edge to make the wide brim stiff enough to be flipped up or down to adjust the look or coverage. Detachable CHIN STRAP - the neck cord can protect your hat from flying off in wind while travelling, fishing, boating or hiking. Size Adjustable - Medium best fits for 55-59CM 21.6"-23.2"; Large best fits for 59-61CM 23.2"-24". With an adjustable drawstring built inside the sweatband.