2XU Men's Elite MCS Compression Shorts Elastane,Lycra,Nylon Imported 80% Nylon / 20% Elastane (Invista LYCRA) Imported MCS (Muscle-Containment-Stamping) applies additional targeted compression to quads and calves for reduced mucle fatigue and greater stability The only graduated compression technology proven to improve performance and speed recovery This item is made of our PWX (Power-Weight-Flex) 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 to help with chafe prevention Antibacterial UPF 50+ Sun Protection