The ASPIRE ZERO in black is our first minimalist sock. Built to be just below the ankle, this sock is considered our "no show" and is only somewhat thicker than our ultra-thin PULSE line. This sock made became famous for its ability to provide the wearer with the benefits of a specially designed compression sock while remaining virtually undetectable. Building on the tradition of manufacturing the best socks we can possibly make in the USA, we strive to improve our products to match your athletic demands. Using the latest machinery available, the new ASPIRE line from Swiftwick is our proudest moment. We considered smaller feet, the narrow foot and athletic activities that demand compression, but less padding in the toe box. We adjusted the formula for key fibers, more than doubled the olefin content and once again, produced the best sock you will ever wear, guaranteed. We have long aspired to create this sock, so the name was obvious. For athletes, the obvious choice is Swiftwick.