Child's UPF 50+ Boonie Style Sun Hat with Contrast Underbrim Sun Protective Cotton UPF 50+ tested. Maximum UV sun blocking rating. Snaps up to be worn "Aussie" style. Brass eyelets and snaps will not rust. Corded chin strap. Size 2-6x. 100% cotton cap with 1" cotton headband and mesh lining means this cap is comfortable. 2 1/2" brim for maximum sun protection.