Flammi Baby/Toddler/Kids Cotton Bucket Sun Hat with Chin Strap (18-36 Months, Dark Denim Blue) 100% cotton. Lightweight & breathable & sweat-absorbent UV protection summer sun hat, protect baby from the sun High quality tailoring and fabrics, light weight & comfortable Adorable sun bucket hat with cute star print. You can button up the hat brim or unsnap to change the styles Windproof chin strap hold hat in place in wind Four hat size for choice: 6-12 Months (Hat Circumference 18.9"/48cm); 12-24 Months ((Hat Circumference 19.7"/50cm); 18-36 Months (Hat Circumference 20.5"/52cm); 2.5-4 Years (Hat Circumference 21.3"/54cm). For Head circumference, is 1-2cm smaller than the hat circumference. Suggested age is only for reference