This dad hat has an adjustable strap and curved visor, made with a mix of cotton twill and polyester. It`s an unstructured, low-profile 6-panel design with 6 embroidered eyelets. Each hat is made on demand to reduce overproduction and comes with traceability info. Thanks for making thoughtful purchases! A (inches) B (inches) C (inches) D (inches) One size 23 ⅝-24 ⅜ 4 ¾ 2 ¾ 7 ½