These trucker caps come in one size with an adjustable plastic snap closure: 22.8" (58cm). The cap's front has six rows of visor stitching. 
.: Material: 100% polyester foam front with 100% nylon mesh weave back
.: One size fits most (22.8"/58cm)
.: Four color combinations to pick from
.: Adjustable plastic snap closure
.: Six row stitching on visor