[UPF 50+ UV protection]: Offers UPF 50+ super sun protection that blocks 99% of harmful UV rays. Sun hats for children protect the sensitive skin of children from sun damage. [Double-Layer Neck Protection]: This hat adopts a double-layer neck scarf, which is soft and comfortable to prevent sunburn of the child's neck. It has quick drying performance, is thin and quick drying, so your child will love it Water can participate in sports in the swimming pool or on the beach. [Safe and fit] There is an elastic band with adjustable cap circumference so that it fits your baby's head perfectly. The chin strap helps keep the hat on the baby's head in strong winds [Practical]: You can simply fold the hat and put it in a small bag [Size] The cap circumference is 51-54 cm (20.07-21.26 inches) and is adjustable.