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. Functional 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 you when you sweat, and warm you when you freeze. Functional zones such as the Innerlap AirConditioning Zone® on the inside of the thighs and Sweat Traps® for targeted management of excess sweat regulate temperature and enhance performance. The ExpansionKnee at the knee joint ensures optimal climate comfort while also providing full freedom of movement.