This Wyeth cowboy hat is composed of 100% wool material that shapes a classic pinched top and a flipped-up, curved brim for a little extra flair. 3.50" hard brim. 22.5" interior circumference with an internal velcro. Crown measures 4.5" tall. 100% Wool. Bought these for my bridesmaids for my wedding and ended up with a couple extra. Absolutely love the hat and it’s universally flattering!