Detroit Lions Men’s PAT 39THIRTY Flexfit Cap. This will be the Detroit Lions official on-field sideline cap for the next 3 NFL seasons. The Lions logo is in raised embroidery center front with the NFL Shield embroidered center back. Unique bill with diamond design. New Era’s Coolera technology wick away sweat to keep you cool and comfortable while their Dryera technology repels weather-related water. 100% Polyester.