Shop for Round Rock Express MiLB 59FIFTY Hats & Caps at lids.ca and show your team pride! Browse a huge selection of New Era 59 50 hats to rep your Round Rock Express team mascot and the New Era flag. Each 59 fifty hat comes in numerical sizes so you can find your perfect fit with a fitted 59fifty hat. The iconic flat bill features the 59FIFTY New Era sticker to prove authenticity. MiLB 59FIFTY caps are the best way to show your fan pride whether at the game or out on the town!