Conquer the peaks of demanding sports with the X-BIONIC® ENERGY ACCUMULATOR 4.0 PANTS 3/4 WOMEN. 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 when you sweat and warming when you freeze. Functional zones such as the Innerlap AirConditioning Zone® on the inner 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 offering complete freedom of movement.