The calf sleeves have the same state of the art technology on cooling and aerodynamic performance as the Insane suit, they are too made with aerodynamic, hydrodynamic and extremely light woven fabrics.The calf sleeves were an essential part of the Sub7-kit when Kristian Blummenfelt blasted by the seven-hour barrier for a full-distance with a time of 6:44:25. The fabric is woven with stripes in the front panel and strategically placed seams for optimal cooling and aerodynamic performance. The calf sleeves are clean cut to make the transition to skin as smooth as possible. It also has silicone grippers at top for added comfort and to keep them in place. You can choose if you want to have your calf sleeves with or without carefully placed turbulators at front to further enhance aerodynamic performance. With this we believe these to be the most advanced calf sleeves on the market. The calf sleeves have an extremely tight fit and are designed to fit as tightly as possible.