he final touch of aerodynamics an ultrabreathable racing sock engineered to minimize drag when shoe covers aren't feasible. Developed and continuously refined with WorldTour feedback the RSR Speed Socks S11 incorporate an aerodynamic textile across the lower leg. The foot portion is engineered to transport moisture and maintain cooling airflow ensuring aerodynamics don't come at the cost of comfort. Grip on the UCI-legal 18cm 7in cuff adds stability in hot intense racing conditions. Foot: 80%Polyamide 10%Polypropylene 10%Elastane; Ankle: 82%Polyester 18%Elastane The finer details FEATURED FABRICSWrapping the lower leg 550CX is a breathable bi-stretch warp-knit textile with inherent aerodynamic properties and a highly elastic second-skin fit. The foot is composed of fast-drying aircooling yarns. CONSTRUCTION/FITAn 18cm 7in cuff extends the aerodynamic gains without violating UCI regulations and Circular Seamless construction eliminates seams and friction across the foot.