Dominate every stride with focused power. The X-BIONIC® EFFEKTOR 4D RUNNING STREAMLITE SHORTS WMN deliver expert-level muscle coordination and temperature control through Effektor® Technology and 3D Bionic Sphere® System with ThermoSyphon®. Neural-Response-Effect Partialkompression® activates nerves to boost muscle reaction and reduce fatigue. Lightweight and breathable, they keep you cool and supported so you run farther, faster, and with confidence in spring and summer conditions.