Castelli's warmest synthetic sock, the Pazzo 18 is sewn with a blend of PrimaLoft and polypropylene yarns to keep your feet warm and dry.
Thicker construction on the soles locks out the cold while reinforced heels and toes enhance durability and guard against blowouts.
Choose from one of three stylish patterns tiled around the ankles: cycling jerseys, water bottles, and socks.
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