These are so adorable we can hardly stand it. . . . All the sizes have the elastic sweatband inside - so there's give and take in the fit. The hats are comfortable on your child's head, so they won't fight having a hat on. The infant size is darling on babies - and all western babies want to wear a hat that looks JUST like mom's and dad's. Nothing hokey here - your kids will look like they just stepped (or crawled) out of the arena. Palm leaf with leather hatbands. Infant - up to 45 cm, Brim - 2 3/4", Crown - 3 1/2" Small - up to 48 cm, Brim - 3 1/4", Crown - 3 3/4" Medium - up to 51 cm, Brim - 3 1/4", Crown - 4" Large - up to 54 cm, Brim - 3 1/4", Crown - 4" Mexican Palm Leaf