Head to the game with a fresh headwear in the New Era Mariners 9FORTY A-Frame Cap. Featuring a lightweight fabric, this cap keeps you feeling comfortable and chic through the highs and lows of the game. Express your Mariners pride boldly all day, every day, with the New Era Mariners 9FORTY A-Frame Cap. Part of New Era’s A-Frame TIRAMISU collection. 100% polyester.