The new 4.0 generation is the first to offer Retina® Ultra-High-Definition quality for unique functional accuracy. The result is an ultra-dense knit that integrates 13 highly effective technologies. Function zones with temperature-regulating and protective effects are precisely positioned to support your performance on cool winter days. The legendary patented 3D Bionic Sphere® System with ThermoSyphon® technology is more powerful than ever: Complex 3D structures and Y-shaped elements maximize air exchange, cool when you sweat, and warm when you freeze. Function zones like the Innerlap AirConditioning Zone® on the inside of the thighs and Sweat Traps® for the targeted management of excess sweat regulate temperature and enhance performance.