Baby Banz Reversible Sun Hats were originally designed in Australia for one of the world's toughest UV environments. Baby Banz Hats have been clinically tested to Australian Standards for Fabric UV protection and have a UPF rating of 50+. The hat is adjustable to fit a range of sizes. Features Velcro closure in the back of the brim to allow easy adjustment for years of wear as the child grows. Material: 100% Cotton, Poly-Cotton Blend PF (Ultraviolet Protection Factor) rating of 50+ and will block out more than 97.5% of UVA and UVB Rays