Castelli Fast Feet 4 Sock Closeout changing the way triathletes dress

changing the way triathletes dress and race

making it even more capable and stable in deep snow

8-base lens curvature offers a wraparound fit

choose Shumo as your go-to

the Swix Navado Hybrid Jacket is there to help us send

Castelli Fast Feet 4 Sock Closeout changing the way triathletes dressThe Castelli Fast Feet sock has the development and testing to back up the aerodynamic claims. Features: Castelli's Fast Feet project for maximum aerodynamics Foot portion based on 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