Boston Red Sox 2020 Official Batting Practice Onfield Cap - Navy. Material: 100% Polyester, High Crown, Structured fit, Flat bill, Fitted, DRYERA ® technology repels weather-related water, MICROERA™ technology acts as an anti-microbial to reduce odor, COOLERA ® technology wicks away sweat, Hex Tech® fabric featuring ultra-lightweight fabric with moisture wicking and UV protective properties, Dash Mark Mesh technology carries water-repellent properties and is paired with a moisture-wicking anti-microbial sweatband, Embroidered graphics, Six panel construction with eyelets, Surface Washable