Detroit Tigers 2018 Road Batting Practice 39THIRTY Flexfit Cap. This cap is designed with New Era’s CoolEra and DryEra technology to keep you cool and dry. It is also made with the brand new fabric blend, ProLight, that is 25% lighter for maximum comfort. The Tigers English D logo is a beveled rubber applique that is very bold and crisp. 94% Polyester / 6% Spandex.