SUN PROTECTION:Smooth and soft polyester, UPF 50+ sun protection blocks 98% of all UV radiation ONE SIZE:Hat Circumference: 19.3-20.9 inches(49-53 cm), fits most children ages 2-6 BREATHABLE:The mesh vent around the crown provides ventilation, keep your little one cool and comfortable ADJUSTABLE:The chin straps holds hat in place and an elastic drawcord with toggle at back for comfortable wear Muti-Functional: This breathable & packable safari sun hat is a must-have for summer. Ideal for wearing in outdoors. It is a perfect hat for kids playing at the beach or in the backyard, go to fishing, hiking, camping, traveling, boating or any outdoor sports and activities.