Flap Happy's UPF 50 plus Flap Hat with ties is available in an array of bright colors and prints. The hat not only looks great, but offers excellent sun protection. Our hat has a large brim, neck flap and chin straps that tie to shield your child's face, ears and neck from the harmful rays of the sun. It pairs great with Flap Happy's clothing and swimwear. Flap Happy Hat Size Chart: X Small fits 14 inch -15.5 inch head circumference about Newborn-3months. Small fits 15 inch -17 inch head circumference about 0-6 months. Medium fits 17 inch -18.5 inch head circumference about 6-12 months. Large fits 18.5 inch -20 inch head circumference about 12-24 months. X Large fits 20 inch -22 inch head circumference about 2 years & up. XX Large fits 21 inch -22.5 inch head circumference about 3 years & up.