Power through every trail with confidence. The X-BIONIC® EFFEKTOR SHIRT SS MEN delivers precision-mapped WaveCompression® that boosts blood flow and muscle endurance while enhancing sweat management via the patented 3D Bionic Sphere® System with ThermoSyphon®. Neural-Response-Effect technology triggers faster muscle reactions, so you stay strong, dry, and unstoppable during your longest, most demanding runs.