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. Sized Xsmall/Infant, Medium=6 1/4-6 1/2, or Large=6 5/8-6 7/8