Flap happy's Upf 50 plus microfiber flap hat is available in an array of bright prints. The hat not only looks great, but offers excellent sun protection and is quick drying. Our hat has a large brim and neck flap to shield your child’s face, ears and neck from the harmful rays of the sun. Pairs great with flap happy's clothing and swimwear. Flap happy hat size chart: small fits 14-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). Xlarge fits 20-inch-22-inch head circumference (about 2 years & up).