University of Michigan Biff the wolverine logo embroidered mens heavyweight 1/4 zip sweatshirt. Sizes Extra Small to 4XL. Tall sizes available in LT to 4XLT. Buy with confidence. We are a trusted ebay seller for over 20 years. See our other listings. All shirts purchased will be sewn similar to shirt shown. Biff, the Wolverine was a live wolverine who served as a team mascot at University of Michigan Wolverines football games and was later kept in a small zoo at the University of Michigan in the 1920s and 1930s. In the mid-1920s, before the acquisition of a live wolverine, the University of Michigan used a mounted and stuffed wolverine, also named "Biff", as the team mascot.  Please email any questions before purchasing. Thanks very much for looking!!