● Elastic closure ● Soft and breathable polyester hat,UPF 50+ protection blocks 98% of UV Rays ● 7cm wide brim will help shield your kids skin and offers extra protection ● The mesh side vents provides ventilation, keep your kid cool and dry ● Adjustable chin straps holds hat in place and an elastic drawcord with toggle at back for adjustability ● Please match with the actual Circumference before purchasing.Size S: 18.9"-20.5" (48-52cm), suggested to 2T-4T, Size M: 20.5"-21.2"(52-54cm), suggested to 4T-6T