Add a fresh and sporty touch to your closet with the New Era White Sox 9FORTY A-Frame UPSD Arch Cap. Crafted from 100% polyester, this baseball cap offers breathability and reliable coverage on sunny days and beyond. Make every outing a home run and stand behind your favorite team with the New Era White Sox 9FORTY A-Frame UPSD Arch Cap. Part of the 9FORTY A-Frame Arched collection. 100% polyester.