Castelli's Fast Feet project provides aerodynamic foot coverings for every condition.
The Fast Feet Sock provides an aero advantage for road racing when it's too warm for the faster shoe covers. Castelli takes the leg portion of its TT shoe-cover and stitches this to its most comfortable sock for in-shoe comfort. The Fast Feet Sock is the same as the aero sock supplied to Team Sky, and it's a riders' favourite.
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