US Open Oakmont Hat 2016 USGA Member Adjustable Baseball Cap Gray One Size The 2016 USGA Member Adjustable Baseball Cap is a stylish and versatile accessory suitable for both men and women. Made of cotton with a canvas fabric type, this gray cap features a solid pattern and an adjustable strap for a perfect fit. Whether you're hitting the golf course or just need a casual everyday cap, this USGA branded hat is a must-have for any avid golfer or sports enthusiast.