This universal trucker mesh hat is style 404M on the order form. These are fitted and come three sizes: XS (6 3/8-6 7/8), SM-MED (6 7/8-7 3/8), and L-XL (7 3/8-8). The crown has a pro-model shape with M3 performance fabric front panels and a spandex mesh back. The sweatband is a 1 3/8” woven elastic comfort fit. All hats are Pacific Headwear. Hover or tap on picture for more info!