2XU Men's MCS Cross Training Compression Tights 80% Nylon / 20% Elastane (Invista LYCRA) Imported MCS (Muscle-Containment-Stamping) applies run-specific targeted compression to quads, calves, and glutes for reduced mucle fatigue and greater stability The only graduated compression technology proven to improve performance and speed recovery PWX (Power-Weight-Flex) is a signature fabric that provides an unparalleled combination of powerful compression, lightweight feel and maximum flexibility Drawstring elastic waistband for secure and comfortable fit Moisture wicking technology to keep you dry and flatlock seams for chafe-prevention Antibacterial UPF 50+ Sun Protection