This isn't a sock--it's an extension of the system. At just 15 grams, the PI Black Woven Aero Sock brings 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.Engineered for speed and control, the PI Black Woven Aero Sock delivers aerodynamic advantage in a 15g profile. With a ribbed stretch-woven upper, seamless toe, and silicone gripper cuff, it stays locked in when the tempo rises--proving even small details make a difference.