New Era Boston Red Sox 39 Thirty cap fly your own flags.

The "39THIRTY" refers to a specific style of baseball cap manufactured by New Era Cap Company, characterized by its stretch-fit design and structured yet flexible crown. Key features of the New Era 39THIRTY style: Stretch Fit: These caps are designed to offer a comfortable and flexible fit due to the integration of spandex or similar materials in their construction, allowing for a range of head sizes within a given size category (e.g., Small/Medium, Medium/Large, Large/X-Large). Structured Fit and Curved Bill: The 39THIRTY typically features a structured front panel that maintains its shape, along with a pre-curved visor, providing a classic baseball cap silhouette. Embroidered Graphics: As seen in the image, these caps often showcase embroidered team logos and other graphics, such as the Boston Red Sox "B" in red with white trim. Material Composition: Common materials for 39THIRTY caps include polyester and spandex blends, contributing to their stretch and durability.