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

Castelli's Fast Feet project — for riding in warm conditions

The foot portion is based on the Castelli Rosso Corsa Sock for in-shoe comfort

Polyurethane grip strip at top to keep sock in place

Leg portion constructed with engineered grooved Lycra® to help detach airflow

TECHNICAL FEATURES

Insulation 1/5

Waterproofness 1/5

Windproofness 1/5

Breathability 4/5

Lightness 4/5

• Weight:48 g
• Temperature:10°C - 38°C / 50°F - 100°F