Rep the St. Louis Cardinals with a bold retro twist in the New Era Cardinals 9FIFTY A-Frame Classic Cap. Crafted from 100% polyester, this baseball cap is breathable and easy to wear from the first pitch to the last out. Bring competitive energy to your everyday style with the New Era Cardinals 9FIFTY A-Frame Classic Cap. Part of the 9FIFTY A-Frame Stacked Retro collection. 100% polyester.