Get eye-catching, authentic MLB headwear that’s designed for all-day comfort by grabbing the official New Era Boston Red Sox MLB League Essential 39THIRTY cap. Built around a contoured and structured crown with integrated Stretch Fit technology, the cap features a Red Sox logo on the front and an MLB logo at the rear. The fitted design means you enjoy custom sizing, while the curved visor helps regulate your temperature on warm days. Our signature New Era flag is embroidered on the left-hand side of the crown. Boston Red Sox MLB League Essential 39THIRTY cap Boston Red Sox logo at front MLB logo at rear Embroidered New Era flag at left Contoured and structured crown Fitted design with Stretch Fit properties Curved visor 97% Cotton and 3% spandex woven