Activate your full strength on any run with X-SOCKS® RUN ENERGIZER® 4.0 MEN. The over calf model from the X-BIONIC® 4.0 generation delivers unmatched perfection from X-SOCKS® innovative labs. Precisely positioned functional zones provide even more comfort than you previously enjoyed with X-BIONIC® products. Among the perfected technologies is the Air-Conditioning Channel® 4.0 with a fresh air-pump effect to optimally ventilate your sole. To enhance the relaxed barefoot feeling, the Lambertz-Nicholson Achilles Tendon Protector 4.0 with its reinforced, shape-optimized padded zones absorbs the pressure and friction of the shoe and cushions the impact of running on uneven terrain. The strength of the X-SOCKS® Run Energizer® 4.0 also lies in the activating effect of the Smart Compression Zone: gradual compression accelerates the transport of venous blood to the heart. Your cardiovascular system is relieved and you have more energy available for long-lasting performance.