New New York Mets 39THIRTY Stretch Fit Baseball Cap Black Blue Orange SZ SM-MD. Official New Era 39THIRTY New York Mets stretch fit baseball cap in black with the team logo embroidered on the front in blue and orange. This fitted-style cap features a curved brim, structured crown, and perforated side panels for added breathability. MLB Genuine Merchandise branding and size marking are included inside the crown. Clean and ready to wear or collect.