Castelli Custom Fast Feet Socks

For road racing or when you can't wear a Fast Feet TT Shoecover, this sock saves watts.

Castelli's Fast Feet project: aerodynamic foot coverings for every condition. The TT shoecover is designed for maximum aerodynamics in time trialing, within the limits of the UCI rules. We developed it through CFD analysis followed by extensive fabric and on-bike wind tunnel testing. The smooth silicone-coated foot portion smooths out the shape of the foot, while the grooved leg portion helps detach the air as it flows around the leg. The shoecover is cut high, reaching to the calf. There's no reason not to wear it on the road, but its gains are maximized at TT speeds.

Product features

• Castelli's Fast Feet project – for road riding in warm conditions


• The sock portion is based on a normal sock for in-shoe comfort


• The leg portion is constructed with engineered grooved Lycra® to help detach airflow

Technical Features

• Insulation: 3/5


• Waterproofness: 1/5


• Windproofness: 2/5


• Breathability: 3/5


• Lightness: 4/5

• Sizes: S/M, L/XL, XXL


• Weight: 51gm


• Temperature: 10°C - 30°C


• Fit: Aero

MINIMUM ORDER QUANTITY (MOQ) OF 10