Our already inexpensive Big Skinny wallets become the bargain at BigSkinny.net. Even if you already own five Big Skinny wallets, it's time to buy more for friends and even those odd relatives or coworkers on your "maybe" gift list. Big Skinny, the American inventors of the world's skinniest wallets, has created super thin wallets using proprietary nylon microfiber. This material is ultra-skinny, but tough enough to stand up to cleaning in the washing machine. For those who love leather, Big Skinny hybrid leather wallets have premium-quality cowhide leather on the outside and nylon microfiber on the inside, so they're still skinny.