Offering a classic double-fold-over design, The Big Skinny tri-fold wallet is smaller in surface area when folded than most wallets. You'll be able to store between 20 to 25 full-size plastic cards in its four extra-wide pockets. It also features a full-size billfold area, an id pocket with a clear plastic window for easy access to your driver's license or work badge, and two oversized hidden storage pockets. The extra-wide pockets are lined with a rubbery coating to prevent cards from slipping out. Designed with rounded corners for comfort, It's constructed of a lightweight, water resistant nylon microfiber material that is 5 to 7 times thinner and lighter than leather. It's machine washable for easy care, and it dries out in about 20 minutes. The tri-fold wallet measures 3 x 4-1/8 inches (and 5 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.