10 Best Historic Things to See in Boston Step Back into Boston's Past Boston MA Wallpapers Top Free Boston MA Backgrounds WallpaperAccess Boston International Atlantic Economic Society Fenway Park and Fun in Boston Backyard Road Trips Your Trip to Boston: The Complete Guide Boston Red Sox Trucker Hat. The Boston Red Sox Trucker Hat is made with 100% polyester and a mesh back for added breathability and ultimate comfort. Finished with the signature logo on the front, the back features an adjustable snapback closure for a one size fits all hat. This hat is the perfect accessory that works just as well on the golf course as it does off. This custom product is part of our limited edition Greyson x Boston Red Sox capsule, following our collaboration by Greyson for the MLB. 100% Polyester Spot Clean If Needed.