Castelli Fast Feet 4 Socks Electric Blue - L-XL

The Castelli Fast Feet 4 Rosso Corsa socks are described as aerodynamic. They have undergone development and testing to support this claim. The few socks that have been tested have probably been assessed using a static test, without movement, because it is easier. However, a foot is always in motion, so a rig has been created that reproduces the movement of the lower leg. These socks can save 2 watts at 50 km/h. The latest version has an improved cuff fit to increase comfort and enhance aerodynamics.Features:Castelli’s Fast Feet project: for maximum aerodynamicsFoot section based on Castelli Rosso Corsa socks for greater comfort inside the shoesPolyurethane gripper at the top to keep the sock in placeLeg section made from ribbed Lycra to facilitate airflowWeight: 48 gTemperature: 10°C - 38°CFit: Race