Material: The smile face baby sun hat made of high quality polyester(UPF 50+ UV sun protective fabric), quick-drying, breathable toddler sun hat keeps baby cool and comfortable Hat Circumference(3 Size): baby hat 0-6 months:17.32-18.11in , baby hat 6-12-24months: 19.7-21.4in,2-5T: 19.7-21.4in Design: The Baby bucket hat has a chin strap to keep it stay on baby head, wide brim will protect babies' head, eyes, face, neck from strong sunlight. Occasions: Summer must-have baby sun hat for toddlers playing at the beach or in the backyard, go to fishing, safari, travelling, camping, boating and other outdoor activities.