Stay one step ahead and benefit from the performance boost of innovative technologies with the X-SOCKS® RUN SPEED TWO. With their optimally combined ventilation and protection features, these socks from the X-BIONIC 4.0 generation are perfect for middle and long-distance runs. Compared to previous models, you can expect even more comfort and performance-enhancing precision. The newly designed Air-Conditioning Channel® 4.0 is embedded in the tightly knitted material to ventilate the soles of the feet. The instep protector with extended Air-Cool stripes ensures the climate control of the top of the foot while also protecting it from pressure and friction.