This isn't a sock - it's an extension of the system. At just 15 grams, the Pi PRO/BLACK Woven Aero Socks bring wind-cheating precision to every pedal stroke. The ribbed stretch-woven upper smooths airflow for measurable aerodynamic gains, while a 360° arch tension band locks the fit in place through max efforts and high cadence. Inside, a seamless toe construction eliminates friction in snug race shoes, and the moisture-wicking footbed keeps your base dry and cool under pressure. A silicone-printed gripper cuff prevents slip, and UPF 50+ protection shields exposed skin from the sun. Ultra-light. Second-skin fit. Marginal gains that add up to miles.