DURABLE: With their optimally combined ventilating and protective functions, these X-BIONIC 4.0-generation socks are perfectly suited for medium- and long-distance races. Compared to previous models, you can expect even more comfort and performance-enhancing precision
CLIMATE CONTROL: The newly designed Air-Conditioning Channel 4.0 is embedded in the densely knit material to ventilate the soles of the feet
PROTECTION: The Instep Protector with extended Air Cool Stripes provides air conditioning for the back of the foot and simultaneously protects the instep against pressure and friction
CUSHIONING: The comprehensive cushioning system also includes the high-performance AirFlow Ankle Pads 4.0 at the ankle and the shape-optimized Lambertz-Nicholson Achilles Tendon Protector 4.0 above the heel
100% PURE SWISS ENGINEERED: crafted for perfection, worn by top world athletes, 700+ international awards and test wins