2XU Light Speed Compression Tights Men’s Black Sage Reflective UK XL ONLYThe Light Speed Compression Tights with revolutionary Muscle Containment Stamping (MCS) technology, are developed with a detailed understanding of the impact running has on the legs, reducing muscle movement, damage and fatigue for your best run yet. On the inside of the tights, 2XU has developed MCS, which is a system for targeted and more powerful compression. The MCS system has extra patterns that follow the muscle structure, tendons and nerve