X-BIONIC baselayers are genuinely high-tech garments that incorporate a range advanced features in their design which deliver high performance capabilities. The features tailor different parts of the garment to offer variable levels of breathability and insulation that are appropriate to different parts of the body. Maintaining body temperature at the optimum 37 degrees C.Perfect for activities that involve high levels of exertion in cold conditions. With this new evolution of the acclaimed Energy Accumulator EVO range, everything is bigger and better: all of the function zones have been increased in size, delivering greater effectiveness, helping protect organs from penetrating cold, and fabric that dries three times quicker than its predecessor. All of this, plus X-BIONIC"s X-Impact technology (high compression), will help enhance your performance. The ISO-Shoulder, Air Conditioning Channels, AirComPlex Zone and 3D-BionicSphere System technologies are targeted at specific areas of the body, to provide thermal protection, ventilation and cooling ensuring outstanding performance.KEY TECHNOLOGIESEnlarged 3D-BionicSphere-System in the chest area: This system is designed for high-intensity physical exertion and provides ventilation and cooling.ISO-Shoulder: 50% higher thermal protection on the shoulders with an insulating layer to keep penetrating cold at bay.Air Conditioning Channels: 30% more fresh air. Physiological studies have shown that the chest area is an optimal zone for quick and effective venting and cooling. AirComPlex Zone: At the solar plexus, directly under the 12th thoracic vertebrae, important nerve fibers receive signals that influence one"s entire well-being. The Accumulator Evo Shirt protects this sensitive area with special channels. Warm air enclosed there insulates optimally in the cold. 3D-BionicSphere System on the back: The 3D-BionicSphere Syste