Castelli Rosso Corsa 13 Socks A great pair of socks makes a big difference in foot comfort. So Castelli have made the main foot part of the sock in Air Mesh to enhance breathability & given it a central foot band for support. The ankle cuff is 13cm high for just the right length & features a top band that is doubled over so that the elastic will stay perfect over time. The Meryl Skinlife fibres contain naturally bacteria-static silver ions so that bacteria will not grow in your shoes, yet it doesnt harm your feet. Meryl Skinlife antibacterial fibres Diaphanous web on top of foot High-density elastic mid-foot support band Flat-seam toe 13 cm ankle cuff Castelli Sizing Guide