MCS All Sport Tight and Top You’re dying to know what MCS stands for, right? Muscle Containment Stamping, of course. This fabric support system is designed to target key muscle, tendon and fascia groups and reduce muscle oscillation and damage. The top “maps” the traps, lats, pec and deltoid muscles to limit tension in the shoulders and support your back. The tights are designed to provide stability and support to the glutes, hamstrings and calves, while using PWX Flex 70D fabric on the front panels for the quads. Despite all this support and compression, these comfortable tights provide lots of flexibility and, thanks to the Invista Lycra, are really durable, too.