Performance socks require many things. The most important is the fit! Without the perfect fit, the rest of the sock cannot perform the way it needs to in order to keep your feet feeling great all day long regardless of the activity. With the swaggr PerfectFIT Technology, forget about trying to choose which size of socks you need. We have solved this problem. Our socks are all one size, and they fit you, regardless of foot size, in the areas that your feet require to maintain comfort and peak performance all day long.