ace of hats | Accessories | Mint Green 0 Wool Hat Wide Brim 。One size(57cm) 22 1/2 \" adjustable feature under interior band allows this hat to fit a wide range of sizes. Flip the inner band to reveal the velcro strap/string and use it to size up or down up to 1 inch as needed. Sizing runs slightly wide/large due to crown design, please add a complimentary hat filler if you are in-between sizes.If your hat isn\'t a snug fit, the complimentary hat filler is made from vinyl foam, the adhesive filler sticks to the inside of your hat for a better and smaller fit. Reduces your hat size by approximately 1-2.5 cm. Can be used the whole way around your hat or just partially, if you are only wanting to reduce your hat size by a small amount.