The castelli free x13 socks has been designed to match the rest of castelli39s free aero range the socks offer enhanced coverage for your lower legs and they have a slight anatomic fitting for maximum comfort when you39re foot is in the riding position these socks have a 13cm height for the pro look and they have a reinforced midfoot band the band keeps the socks in place preventing them from slipping down these cycling socks have been creating using meryl skinlife antibacterial