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Coming into its 7th year in the Castelli line, the Rosso Corsa continues to be their best-selling sock because it’s that good. The Meryl Skinlife® yarns feature bacterio- static 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 they obsess about a sock.