Perfect hat for the infants. Made of 100% Polyester. Stiff and pre-curved bill. Low profile. Structured crown. Trucker Mesh Back for easy cool off. Fitted with an inner hat band. Adjustable hook and loop closure. One size fits most infants. This hat measures to Fitted Hat size 6, Circumference of 19in (48 cm), Crown is 4 inches deep and the bill measures 2.25 inches long.