Customize the T-shirt with your favorite dirt racing photo. You can upload any photo; it doesn't have to be a dirt racing picture. Solid colors are 100% ring-spun cotton Made in the USA or Imported Sport Grey is 90% ring-spun cotton, 10% polyester Customize the T-shirt with your favorite dirt racing photo. You can upload any photo; it doesn't have to be a dirt racing picture. Solid colors are 100% ring-spun cotton Made in the USA or Imported Sport Grey is 90% ring-spun cotton, 10% polyester