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Castelli Fatto 12 Sock


Item # CST00EB

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  • Black/Sky Blue, XXL ($19.95)
  • Black/Sky Blue, S/M ($19.95)
  • Black/Yellow Fluo, XXL ($19.95)
  • Black/Yellow Fluo, S/M ($19.95)
  • 100% Guaranteed Returns
  • Free 2-Day Shipping
    on orders over $50

Item # CST00EB


Extra insulation.

Some days, all we need is a thin, streamlined pair of socks with just a little bit of extra warmth, but on the really frigid and snowy days, we want all the insulated protection we can stuff into our favorite pair of cycling shoes. On those days, pull on a pair of Castelli Fatto 12 Socks and bask in cozy, insulated warmth.

Made from a mix of soft PrimaLoft and polypropylene yarns with terry cloth to boost those fabrics' already insulative properties, the Fattos will be your best friend through winter training rides, bone-chilling commutes, and overly air-conditioned office environments.

  • Insulated socks keep your feet warm in frigid temperatures
  • Soft fabrics are warm and comfortable
  • Cuff height provides ample ankle coverage

Tech Specs

PrimaLoft and wool, terry cloth
4.7 in
Recommended Use:
Manufacturer Warranty:
1 year

Size Chart


US MEN'S SHOE SIZE 4 - 7 8 - 10 11 - 14
US WOMEN'S SHOE SIZE 5 - 7 8 - 10 11 - 12

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Great sock

  • Size Bought: Large

Good support. Keeps your foot dry. Durably constructed. Warm and comfortable in temps from 45-75. Haven't tested at warmer temps because it doesn't get warmer here.