The X-BIONIC® UnderWear impact technology caters to three individual performance and comfort demands. Whilst the Energy AccumulatorTM supports the skin by applying counter-pressure, the Bionic EnergizerTM stimulates a feeling of well-being. The Bionic VitalizerTM gives your body natural freedom. The tights fit to your body without constricting. The X-BIONIC® UnderWear Principle: The Three Dimensions of Comfort 3D-Bionic-Sphere® System Wherever a significant amount of perspiration forms, the 3D-Bionic-Sphere® System is always there at the ready. The result: no feeling of dampness or overheating, no risk of chill in rest periods. Cooling is only activated upon increase of body heat, and when perspiration begins. If there is no perspiration, the thermal insulation is active. The 3D-Bionic-Sphere® System only begins to cool when you perspire. During Sport Perspiration forms a fine film of moisture on the skin. Droplets are absorbed in SweatTrapsTM and directed to the Surface ExpanderTM where they evaporate. Evaporation activated by body warmth occurs on three levels: On the skin, for cooling purposes. In the SweatTrapsTM, where excess moisture is absorbed. In the Evaporation Surface ExpanderTM, where the excess finally evaporates. Rest Periods Cold ambient air is no longer a risk factor for chilling as the InnerAir-ChannelsTM form an insulation cushion from the warmed air. During rest periods no perspiration is produced and the cooling process is interrupted. The air then protects and warms in both channels, which creates a body aura from body warmth - a climate controlled protective cover which insulates you from the cold.