Perfect for those on the go who want to keep down the bulk, the Compact Sports bi-fold wallet offers a thin profile that still can carry all your necessary cards and cash. This version of the Compact Sports Bi-Fold features an exterior constructed of top grain cowhide leather and an interior made of Big Skinny's ultra-thin nylon microfiber material to help keep it thinner than a typical wallet. Despite its compact size, it can hold 20 plastic cards in its extra-wide card pocket, ID pocket (with clear window) and two oversized hidden storage pockets. It also features a full-sized billfold area. The extra-wide pockets are lined with a rubbery coating to prevent cards from slipping out. The Compact Sports bi-fold wallet measures 4-1/2 x 3-1/16 Inch (and 4 mm thin when empty). The first Big Skinny wallet was designed by Kiril Stefan Alexandrov (the company's founder) because he loathed sitting on a thick, heavy leather wallet. Since creating the original Sport Wallet in 2005 using an advanced nylon micro-fiber material (5 to 7 times thinner than leather), Big Skinny has added dozens of slim wallet styles for men and women with more on the way.