Maru Exs Pro Suit with High Leg. Suit Composition: 78% Nylon/22% Lycra EXS: Advanced swimwear technology performance, fit durability, style. For training, competition and fitness. Created using LYCRA POWER by Dupont, EXS is scientifically enhanced swimwear proven to improve performance by up to 30%. Rigorously-tested, precision equipment for serious swimmers, EXS works in sync with the body and mind, increasing accuracy and efficiency of movement, reducing muscle vibration, a major cause of muscle fatigue, and improving total force and power production by an average of 12%.