The Premium Mid is part of our signature sock line. It has successfully been marketed for over 9 years as The Most Comfortable Sock on Earth and sold at high-end retailers all over the world. It is made of combed terry cotton and features a padded footbed, air vents, compression calves, and Strideline branding across the heel strap. If you want the best sock on the market, this is it! Each sock starts as a pre-knit base with a 3.5 x4.5 inch design space - this is a fully customizable window is where we can dial in logos, trademarks, and even PMS color match to meet the specifications of any organization.