Master every mile with confidence. The X-BIONIC® STREAMLITE 4.0 RUNNING JACKET WMN optimizes sweat management through the 3D Bionic Sphere® System and ThermoSyphon® technology, cooling when warm and insulating when cold. Enhanced Sweat Traps® prevent dripping sweat while 3D TRYCE System adapts to maintain ideal temperature. Experience controlled comfort and focus on your performance all year long.