Castelli's Fast Feet project: 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 shoecovers. We take the leg portion of our TT shoecover and stitch it to our most comfortable sock for in-shoe comfort. It's the same as the aero sock we supply to Team Sky, and it's a riders' favorite.
Castelli's Fast Feet project – for road riding in warm conditions
The sock portion is based on Castelli's Rosso Corsa sock for in-shoe comfort
The leg portion is constructed with engineered grooved Lycra® to help detach airflow