Third-generation aero socks that stay up with a soft woven foot and grippers at the top to keep them firmly on your calves with our latest motociclo design.   The fastest socks on the planet, Aero socks provide the best bang for your buck when it comes to aerodynamics. Surprisingly these 25-dollar socks will give you as many free watts - about 4-8 according to studies; as many much more costly and far less stylish accessories. Our aero socks boast comfy woven socks on the foot section, just like your regular socks - to produce more traction, so you can wear them every day. When choosing a size it is best to use the size of your calf more than the size of your foot. Modern synthetic socks stretch very well and the more important part is how high you would like them and how well they will fit your legs. 6.5 inch (16.5 cm) lay flat ankle height. When wearing they stretch to approximately 8 inches (20cm) high.