Conquer winter challenges with confidence. The X-BIONIC® ENERGY ACCUMULATOR 4.0 MELANGE PANTS MEN provide expert temperature regulation using the 3D Bionic Sphere® System and patented ThermoSyphon®, which cools with sweat and insulates when cold. Expansion Ribs® ensure insulation with full freedom of movement. Perfect for long days on the mountain, these pants keep muscles warm and dry so you perform stronger, longer.