RSR BOLIDE Socks S11

ASSOS RSR BOLIDE Socks S11

WorldTour-proven race socks with UCI-approved design: The ASSOS RSR BOLIDE Socks S11 rely on drag-reducing textiles and a second-skin fit to measurably reduce air resistance on the lower leg. The 19 cm cuff height is consistently optimized for aerodynamics and replaces additional aero overshoes in many race situations. Developed and validated in the wind tunnel with ASSOS AeroScience, they combine minimal layer thickness with high breathability. As dedicated race day equipment, the manufacturer recommends using grip spray for maximum stability, especially during long efforts and high cadences. These characteristics make the BOLIDE S11 a focused choice for ambitious riders in Swiss cycling.

• UCI-approved race sock with aerodynamic focus
• 19 cm cuff height to optimize airflow on the lower leg
• Second-skin fit without excess material or wrinkles
• Wind tunnel-verified with ASSOS AeroScience
• Can reduce the need for aero overshoes
• Very lightweight, highly breathable construction for race use
• Recommended grip spray for secure fit on race days
• Material composition: Ankle 56% PL / 24% PA / 20% EA; Foot 85% PA / 15% EA

Technical Details and Features

The RSR BOLIDE Socks S11 combine targeted material zoning with a second-skin construction, so the foot and ankle area are enclosed snugly and smoothly. The 19 cm high cuff stabilizes airflow where rotating lower leg surfaces are particularly aerodynamically relevant, and is designed as a race day solution without additional layers. Drag-reducing yarns are used for the ankle area, while the foot section is designed for grip, lightweight performance and moisture management. Development and verification in the wind tunnel with ASSOS AeroScience underscore the performance claim. For regulation-compliant use in competition, the UCI sock height rule applies (Art. 1.3.033): socks may not reach higher than half the distance between the lateral malleolus and fibula head, clearly defining the aerodynamic height.

Applications and Benefits

On road cycling routes, in criteriums and time trials, the BOLIDE S11 plays to its strengths when every watt and every transition counts. Eliminating aero overshoes reduces weight, layer thickness and dressing effort, providing a practical advantage before the start as well as in hectic race situations. The high breathability supports consistent thermoregulation during intense efforts, which is particularly appreciated on warm race days on Swiss roads. Thanks to the second-skin fit, the silhouette remains smooth, keeping the aerodynamic effect consistent. Note that this is race day equipment: for maximum cuff hold, ASSOS recommends grip spray, especially at high speeds and longer distances. The UCI-compliant design also helps avoid discussions during checks in the start area.

Notes on UCI Compliance and Handling

For licensed races, it's advisable to mark the individual cuff height on your leg beforehand, so the 19 cm cuff height when worn stays safely below the UCI limit. In practice, it's proven effective to determine the midpoint between the outer ankle and fibula head and let the sock end below that to eliminate tolerances. Combine the BOLIDE S11 with smooth leg warmers or a tight-fitting race suit only if the overlap doesn't exceed the defined height. This way you use the aerodynamic advantages of the sock without violating the regulations, avoiding possible sanctions under the UCI clothing regulations clarified in 2019.