Our best-selling Buy. Sell. Invest. design on a six-panel trucker cap with a mesh back.• Structured, mid-profile, six-panel cap• 60% cotton, 40% polyester*• Hard buckram front panels• Mesh back• Permacurv visor, matching under-visor• Plastic adjustable closure• 3.5 crown (8.9 cm)• Head circumference - 21 5/8 to 23 5/8 (54.9 cm to 60 cm)*The percentage can change a little from hat to hat