Skins wrap and support key muscle groups, which reduces vibration and helps maintain muscle alignment. The fabrics also draw moisture away from the skin, keeping you dry. SKINS also helps to regulate body temperature in both warm and cool conditions. Muscles warm up through enhanced circulation and excellent sweat management system helps to circulate air, keeping you cool. Skins help to improve the supply of oxygen to activate muscles, enhancing natural performance and increasing the turnaround of metabolic waste and reducing the build up of lactic acid. The Skins A400 Compression Running Shorts are designed to be used during training, which incorporates a technology that has been tested on hundreds of real athletes using 3D body scanning and dynamic compression measuring techniques. This helped SKINS determine exactly where compression is needed for optimal circulation, injury prevention and maximum comfort. With 400 fit and dynamic gradient compression, you'll notice improved core body control and power, as well as less muscle soreness post-exercise. In addition, biomechanically placed Memory MX fabric around the ITB band and TFL muscle group provide constant, controlled compression and unrestricted movement to help you to avoid muscle damage.