Made of 100% woven raffia straw, our Pietro wide brim sun hat features an open weave pattern around the crown allowing for nice air flow and is finished with a gros grain ribbon trim with a tacked down bow that matches the ribbon piping around the upturned brim. Bonus: You can customize the fit using the size adjuster hidden in the sweatband under the label. Pietro has a crown height of 5in. and a brim length of 4in. This hat is one size fits most. It is 57cm with a size adjuster hidden under the label that allows you to size down.