NEW USGA 2017 U.S. Open Baseball Golf Hat - Erin Hills (Wisconsin) Brooks Koepka won this tournament, this hat is new, never worn. There is a matching enamel magnetic ball marker attached to the hat. 100% Cotton, Adjustable with sliding buckle. Logo embroidered on the front, "USGA Member" embroidered on the back. One size fits most. Will be shipped in a box for protection. From a smoke free, pet free home.