Compressport Pro Racing v4.0 Bike Socks High-cut, stylish cycling socks with enhanced aerodynamic performance and optimised ventilation for fast, comfortable riding. Designed with improved aerodynamics thanks to a cycling-specific, increased sock height and Aero.dot technology, the Pro Racing v4.0 Bike Socks from Compressport reduce drag and improve comfort, speed, support and ventilation for all-round better performance. Tight arch support helps to activate venous return and boost blood flow during effort, enhancing performance and prevent movement of the sock as you cycle. Offering high comfort during long days on the saddle, the Pro Racing v4.0 Bike Socks are highly breathable with ventilation in key areas and are constructed with an ergonomic fit. Size Guide Small / T1 - UK 2-5.5 / EU 35-38 Medium / T2 - UK 5.5-7 / EU 39-41 Large / T3 - UK 7.5-9.5 / EU 42-44 X-Large / T4 - UK 10-12.5 / EU 45-47