Stay cool and look sharp with the New Era Astros 9FORTY A-Frame UPSD Arch Cap. Crafted from 100% polyester, this baseball cap stays strong and flexible for a comfortable fit. Whether it’s game day or off-day, keep backing your team like a pro with the New Era Astros 9FORTY A-Frame UPSD Arch Cap. Part of the 9FORTY A-Frame Arched collection. 100% polyester.