Coming into its seventh year in the Castelli line, the Rosso Corsa continues to be our best-selling sock because it¿s that good. The Meryl Skinlife yarns feature bacteriostatic silver ions to keep your feet and shoes fresh, the cuff cradles your ankle just right, and the diaphanous web construction keeps your feet cool. Try a pair and you¿ll understand why we obsess about a sock. Available in 6cm, 9cm and ü,ber cool 13cm pro-style versions.