●Kids sun hat is made of premium 100% polyester,so it is breathable, quick-drying,lightweight and comfortable wear ●UPF 50+ sun protection fabric block 98%+ of damaging UV sun rays ●Adjustable chin cord keep your hat safety in windy day, hat with drawstring at back for flexibility ●Moisture wicking sweatband, wide brim hat with mesh airflow vents for comfortable wear ●Please match with the actual Circumference before purchasing.Size S: 18.9"-20.5" (48-52cm), suggested to 2-4 Years, Size M: 20.5"-21.2"(52-54cm), suggested to 4-6 Years