Conquer the peaks of demanding performance sports with the X-BIONIC® ENERGY ACCUMULATOR 4.0 PANTS 3/4 MEN. The new 4.0 generation is the first to offer Retina® Ultra-High-Definition quality for unique functional accuracy. 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, cooling you when you sweat and warming you when you freeze. Functional zones such as the Innerlap AirConditioning Zone® on the inside of the thighs and the ISO-CalfPad in the calf area regulate temperature and enhance performance. The ExpansionKnee at the knee joint provides optimal climate comfort while allowing for full freedom of movement.