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Set yourself apart from the big field and secure a top spot in medium- and long-distance races with the X-SOCKS® RUN SPEED ONE. The new models of the X-BIONIC 4.0 generation will convince you that outstanding quality can be further improved. You’ll enjoy the comfort that comes from the perfect combination of protection and ventilation functions. The finely woven fabric of these men’s socks incorporates the optimized Air-Conditioning Channel® 4.0, which ensures even more effective ventilation for the soles of the feet. The comprehensive cushioning system, which protects against blisters and injuries caused by pressure or impact, includes the shape-optimized Lambertz-Nicholson Achilles Tendon Protector® 4.0. The Instep Protector has been augmented with extended Air Cool Stripes to ward off mechanical impacts and improve ventilation in the instep area. The powerful AirFlow Ankle Pads 4.0 additionally shield the sensitive ankle zone.