This Arizona Diamondbacks Club Trucker Hat features a buckle closure and four mesh panels to help create a customizable, breathable feel. Its embroidered team details on the crown let you support your favorite ball club with ease. [] Product Details:100% organic cotton - front; 100% polyester a " back. Hand wash. Imported. Style: NB0399RSDQS; Color: Black; Size: M/L; Gender: Male; Age Group: Adult | Arizona Diamondbacks Primetime Club Men's Nike MLB Trucker Adjustable Hat in Black, Size: M/L | NB0399RSDQS-Y74