Back To The Future Shirt Biff's Automotive Detailing Charcoal T-Shirt Now, you can show your support of Biff's Automotive Detailing with this Back To The Future t-shirt. This shirt features an image of Emmett Brown's DeLorean in need of a waxing. Buy yours today! Officially Licensed Available in Small, Medium, Large, XL & 2XL AC-BTF5300