Castelli Espresso 18 Socks Developed to give a perfect match to the Espresso kit, the Castelli Espresso 18 Socks are a brilliant all-rounder, suited to any type of ride. The functional nylon/elastane fabric gives them a comfortably snug fit while excellent breathability maintains fresh feet when the day warms up. With an 18cm cuff, they give a stylish finish to your summer cycling kit.