One Size Fit Most Women - US Size: 71/4 - 71/2. Head Measurements:22.83 - 23.62 inches,brim Measurements: 3.54 inches, depth Measurements: 5.12 inches. You can adjust the size of the hat through the adjust band inside in the hat. The straw sun hat with chin strap provides extra protection during windy days.You can adjust the size of the hat through the adjust band inside in the hat. The straw sun hat with chin strap provides extra protection during windy days. Adjustable Rope For Windy Day - There is an adjustment rope on the sun hat, which can be adjusted according to its own size. Adjustable chin strap holds floppy hat in place, even during windy day, and is easy to attach and detach. An inner sweatband to help wick moisture away and ensure your utmost comfort. Convenient Carrying Along - This large brim beach hat is folded packable design for easy storage in a handbag or backpack when it is not in use, in this way you save lots of space. It smoothly goes back in shape by wetting, steam or using iron after being folded! Premium Straw Woven Hat - The sun hats are made of paper straw and polyester. Straw material with tight braiding. Lightweight, soft, comfortable and breathable to wear.Adding Stylish & Cool Style - With Brim Flap Cover on this cap, leads to the fashion top trend. Great for outdoor travel, camping, gardening, beach playing, pool, boating, etc.