Push your limits in freezing conditions. The X-BIONIC® RADIACTOR 4.0 PANTS 3/4 MEN reflect your body heat using advanced XITANIT® 2.0 material, manage sweat naturally with the 3D Bionic Sphere® System and ThermoSyphon®, and keep insulation flexible through Expansion Ribs®. Experience unmatched warmth, mobility, and endurance for winter sports performance.