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