Tension Envelopes doesn't sell its products to the public, at least not directly. Instead, it sells customized envelopes in bulk to companies and organizations. So it's pretty fierce that the Kansas City-based company draws attention to its downtown office building with that giant red sign sporting its name in massive block letters. Simply put, Tension knows how to flaunt it, screaming its name at a populace unable to purchase its products. When you really think about it, it doesn't get any more badass than that.