# RSR Speed Booties S11 > Assos RSR Speed Booties S11 - Aerodynamic second-skin overshoes with silicone grip and UCI-compliant height for road cycling and time trials - Price: 87.00 CHF - Brand: Assos - Category: Shoe Covers - Availability: in stock - SKU: P13.62.781.58.0, P13.62.781.58.I, P13.62.781.58.II ## ASSOS RSR Speed Booties S11 The RSR Speed Booties S11 bring WorldTour-proven aerodynamics to your road cycling shoes and fit like a second skin. The S11 generation has been further developed with feedback from the professional peloton and equipped with an integrated **silicone grip** at the ankle for even more secure hold. Measured in the **wind tunnel** and proven in races, the focus remains clearly on low air resistance and stable fit at speed. The upper cuff is designed so that the overshoes reliably sit at **UCI-compliant height** – exactly where the regulations allow. - Aerodynamic **second-skin fit** with racingFit - New **550CX** warp-knit textile at ankle and heel to reduce air resistance - Ultra-elastic **EVA KANT** material at the forefoot for a smooth airflow edge - Integrated **silicone grip** at the cuff maintains UCI-compliant height - **Zero Cuff** with open-edge finishes – without zipper or velcro - Material mix with **PU-coated** front section for increased durability - Available in **three variants** for precise size selection ## Technical Details and Features The 550CX textile fits snugly around ankle and heel and uses its inherently aerodynamic properties to noticeably reduce air resistance. In the toe and forefoot area, the highly flexible **EVA KANT** provides a smooth, close-fitting surface – ideal when every watt counts. The **Zero Cuff** eliminates zippers and velcro, consistently eliminating potential disruption edges. The front section is additionally **PU-coated**, which supports the robust, close-fitting silhouette without compromising freedom of movement. Composition according to manufacturer: Main material 82% polyester / 18% elastane; front area 90% polyamide / 10% elastane with 100% polyurethane coating. ## Applications and Benefits Whether **time trials**, fast training rides or Swiss **club races** – the RSR Speed Booties S11 are designed for maximum speed with stable fit. The integrated silicone at the cuff helps keep the overshoes in place so the height complies with **UCI regulations** and prevents unnecessary discussions in the start area. The smooth surface minimizes turbulence in the critical transition from shoe to ankle, which is particularly noticeable at high speeds and crosswinds. For riders who frequently start under UCI regulations, the design aligned with rule 1.3.033 is a practical advantage. At the same time, ambitious recreational cyclists also benefit from the aerodynamic **racingFit** silhouette and uncomplicated handling without zippers. ## Fit, Variants and Practice The RSR Speed Booties S11 fit according to ASSOS as **racingFit**, meaning deliberately tight and performance-oriented to avoid wrinkles and ensure aerodynamics. Thanks to the elastic construction, they glide over the shoe and nestle cleanly against the ankle without building unnecessary volume. They are available in **three variants**, so you can choose the size to match your shoe and calf circumference. The concept has been refined through **wind tunnel validation** and professional race use, which additionally ensures performance under real conditions. Anyone looking for a sleek, fast overshoe for road cycling applications will find a technically sound solution here from the ASSOS development center in Switzerland. ## Variants - P13.62.781.58.0: in stock - P13.62.781.58.I: in stock - P13.62.781.58.II: in stock --- Source: https://kilometro.ch/en/products/shoe-covers-661/rsr-speed-booties-s11-880