Soft and breathable material. UPF 50+ UV Ray sun protection Adjustable chin strap helps ensure that the baby sun hat remains secured on when windy. Wide brim supplies better protection against UV rays. Foldable and portable,easy to carry for everyday use on the beach, fishing, hiking and so on. Machine Washable. Suitable for baby/kids from 6 months(18.9'') to 8 years(21.3'').we suggest for measure kids head girth, Choose a hat size 0.4"-0.8" larger than kids head girth