100% cotton fabric; 20%cotton/80%polyester lining
FREE SIZE: with an adjustable string at back built-in sweatband. Best fit for 55-58cm 21.6"-22.8" 6 7/8 - 7 1/4.
FOLDABLE: folds up easily, compact and perfect as a fishing or travel hats.
DETACHABLE CHIN STRAP: adjustable for a better fit; won't blown off when it gets windy.
SPF 50+: this sun hat has passed UPF 50+ test, it could block 97.5% or more of sun UV rays.
WIDE BRIM: measures 4 - 4.5" in length, large enough to shade forehead, eyes and cheeks from sun uv ray. The shape looks really adorable.
Fashion Authentic Siggi SPF50+ Foldable Womens Bucket Boonie Sun Hat w/ Chin Cord for Summer Online Shopping