Castelli | Fast Feet 4 Fietssok | White Sock size:40–43 The sleeves are made of

The sleeves are made of a lightweight stretch fabric that fits snugly around the arm

Verstevigingen in voetbed

Butterfly stroke

Engineered mesh upper - Breathable and supportive

Castelli | Fast Feet 4 Fietssok | White Sock size:40–43 The sleeves are made ofCastelli Fast Feet 4 Cycling Sock: Advanced Aerodynamics for Maximum Speed In the world of performance cycling and triathlon, every detail counts. The Castelli Fast Feet 4 Sock is designed to give riders an aerodynamic advantage at high speed. Thanks to advanced material selection and optimized shaft construction, this sock helps reduce drag, so you can ride more efficiently and faster. Engineered for Aerodynamic Performance The Fast Feet series is