Knock your Houston Astros fandom out of the ballpark with the New Era Astros 9Fifty Astrodome. Designed for ardent fans like you, this adjustable cap lets you effortlessly showcase your unwavering pride for the team. The lightweight polyester woven fabric provides comfort and a relaxed fit. Highlight your Astros fandom from the streets to the stands with the New Era Astros 9Fifty Astrodome. 100% polyester woven.