Material: Polyester Sizes: one size (approx. 57-58 cm),one size fits most adults This hat has adjustable band inside that you can draw up and tie to make it fit better for a smaller head. Brim: approx. 10 cm,Height of crown: approx. 11 cm Great for tea party,church dress,etc. This Hat has adjustable band inside that you can draw up and tie to make it fit better for a smaller head.