DALIX Childrens Cotton Twil Cap is Perfect for Outing with the family, or every day use when they are out in the sun. Features a 6 Panel design (with vent holes), adjustable rear fabric strap, light-weight, well ventilated. This is sized for adolescents with head size are 54 CM or 21" in Diameter, with an adjustable strap of about 2-3 Inches")