The Reversible Sun Hat from Kidz Banz is designed to protect children from the unforgiving heat of the Australian sun. The hats are tested to the high Australian standards for UV protection and are rated UPF (Ultraviolet Protection Factor) 50+. Product Features 100% cotton, poly-cotton blend is breathable, fast drying and comfy Velcro adjustment to get a snug fit 50+ UPF (Ultraviolet Protection Factor) Blocks out 97. 5% of UVA and UVB Rays Size: Up to 22 inch head circumference Age guide: 2-5 years