Li-Ning’s Flying Speed series has been a symbol of Chinese-made running shoes since the release of the first generation in 2019. The original Flying Speed was the first thick-soled carbon-plated shoe produced in China, drawing global attention as a groundbreaking innovation. Since then, each generation has introduced unique technologies, and through international race performances, the Flying Speed series has firmly established the brand’s position. Now, the Flying Speed 6 family has arrived. Centered on the Flying Speed 6 Ultra with its four-core power system, the lineup includes Elite and Challenge models, along with the super training shoe Red Rabbit 9 Ultra. These models utilize Super Boom capsule technology in the midsole structure, delivering higher energy return rates and rapid response, providing greater propulsion than previous models. Even as the market matures, Li-Ning continues to advance in material development and design, contributing to runners’ performance improvements. This article analyzes the technical details, running performance, and suitable scenarios of the new models, offering insights for running enthusiasts to make the optimal choice. Li-Ning’s efforts go beyond performance enhancement, holding the potential to shape the future of running shoes.
Evolution History of the Flying Speed Series
Li-Ning’s Flying Speed series has led technological innovation in running shoes. The 2019 original adopted thick-soled carbon plating for the first time in China, attracting global attention. Subsequent generations introduced advancements: Flying Speed 2 featured a composite assist system, Flying Speed 3 incorporated lightweight materials and elegant design, becoming the first Chinese-made shoe to achieve podium finishes in international marathons.
Flying Speed 4 introduced a dual-boost system for optimized energy transmission. Flying Speed 5 adopted a dual-structure design, delivering visual and performance impact. The Flying Speed 5 Ultra, with its extreme specs, achieved consecutive race victories. These evolutions prove Li-Ning’s role in pushing industry standards. Even in the current market environment, the Flying Speed 6 breathes new life into the series with innovative technology and efforts to overcome material research limits.
Revolutionary Midsole Technology of Flying Speed 6 Ultra
The Flying Speed 6 Ultra, as the flagship model, features a four-core power system. It combines upper and lower Super Boom midsole layers with dual carbon plates and Super Boom capsules. The Super Boom capsule seals foam with a special membrane to maintain internal pressure, achieving 95% energy return rate, 3ms response speed, and 6‰ deformation after 100,000 impacts for durability.
The irregular structure and conduits enable smooth gas conduction, facilitating seamless energy transfer from heel to forefoot. Compared to Flying Speed 5 Ultra, it offers improved compression control and conversion speed. The forefoot capsules are key to enhanced output. Weight is slightly increased at 196g, but it retains lightness while delivering powerful propulsion. This technology stands as a symbol of innovation.
- Energy return rate: 95%
- Response speed: 3ms
- Durability: 6‰ deformation after 100,000 impacts
Running Performance and Experience of Flying Speed 6 Ultra
The Flying Speed 6 Ultra delivers an intense propulsion feel, accelerating the runner. In tests, it achieved significant PB improvements over 5km. Heel compression upon landing is rapid, with capsule control accelerating rebound. Mid-to-forefoot landing maximizes effectiveness.
High flexibility increases calf load, making it ideal for high-speed paces. The shoe upper uses composite weaving for improved fit, and the GCU outsole enhances grip. It truly shines at paces under 4min/km. For narrow feet, half a size down is recommended.
Flying Speed 6 Elite: Race-Oriented Design
The Flying Speed 6 Elite is a race-specific model with T0-level performance. It features a three-layer midsole with large Super Boom capsules and T1000 carbon plates. Stack height reaches 39mm (WA limit), targeting top athletes.
The ride feels light and highly efficient in energy conversion, adapting to various landing styles. The upper provides precise control, and the GCU outsole handles wet conditions. Ideal for elites aiming for international race podiums.
Flying Speed 6 Challenge: Versatility and Accessibility
The Flying Speed 6 Challenge is an entry-level model with high-end construction. It features a two-layer midsole with T700 branched carbon plates and upper Super Boom foam, improving kick-off efficiency by 4% and offering wide stability.
Accessible for beginners with low price and performance threshold, suitable for various scenarios. Recommended for marathon runners outside 4 hours. It plays a role in democratizing advanced technology.
New Concept of Red Rabbit 9 Ultra
The Red Rabbit 9 Ultra is a super training shoe. It features a three-layer midsole with Super Boom capsules and glass fiber plates. Plate-free yet with high propulsion, delivering a chemical-reaction-like energy release.
The GCU outsole excels in slip resistance. Ideal for high-intensity training, supporting leg strengthening.
Model Comparison Table
| Model | Midsole Technology | Carbon Plate | Weight (g, approx.) | Suitable Runners |
|---|---|---|---|---|
| Flying Speed 6 Ultra | Four-core system (Super Boom capsules ×2 + dual midsole) | Dual T-type | 196 | World-class elites, limit challengers |
| Flying Speed 6 Elite | Three-layer (Super Boom capsule + dual midsole) | T1000 full-length | - | Marathon sub-3 aspirants, competitors |
| Flying Speed 6 Challenge | Two-layer (Super Boom + standard midsole) | T700 branched | <200 | Beginners to intermediates, heavy training |
| Red Rabbit 9 Ultra | Three-layer (Super Boom capsule + dual midsole) | None (glass fiber) | - | Speed training specialists |
From this table, the Ultra’s complex structure contrasts with the accessible Challenge, while the Red Rabbit 9 Ultra specializes in training. Choose based on running ability and purpose.
Conclusion and Implications
The Flying Speed 6 series and Red Rabbit 9 Ultra embody Li-Ning’s innovation, expanding the possibilities of running shoes. The key is the efficiency improvement from Super Boom capsules. Each model occupies a clear position: recommend Challenge for mid-level runners and Elite for elites. Confirm fit with try-ons.
These developments symbolize a pursuit of change and promote globalization. We look forward to their future success in world races.
