The next generation in 2XU Compression technology - MCS (Muscle Containment Stamping) for targeted compression. MCS is a revolutionary fabric support system traced over key muscle, tendon and fascia groups to focus greater compression power to wrap precise areas and reduce muscle oscillation and damage. Front panels are engineered with powerful PWX FLEX (70D) fabric combined with MCS focused to the quads. Rear panels are engineered with powerful PWX WEIGHT (105D) fabric for support to the hamstrings. Read more… The Elite MCS Compression Short offers unparalled power and protection against muscle trauma during intense activity. MCS the next generation of compression Breaking it down, Muscle Containment Stamping (or "mapping") is a patterned elastic-style material that lines the inside of the compression fabric to provide an extra targeted area of compression without excess bulk. The stamping is its own layer, additional to the fabric not within it, and can be applied precisely where needed to support muscles, tendons, ligaments and fascia groups. Added compression accurately shaped to your anatomy provides extra support to key muscle areas and lessen muscle oscillation, reduce fatigue, energy wastage and soreness.