Li-Ning Feidian 5 Challenger 。Like-new condition. Unleash your potential with the Li-Ning Feidian 5 Challenger, a high-performance carbon-plated running shoe that bridges the gap between daily training and race-day speed. Featuring Li-Ning\'s revolutionary BOOM technology and a full-length carbon fiber plate, this lightweight trainer delivers exceptional energy return and propulsion for runners seeking versatility without compromise. BOOM Midsole: Supercritical PEBA foam provides ultralight cushioning with an 89% energy return rate, delivering responsive comfort mile after mile T700 Carbon Fiber Plate: Full-length carbon plate engineered for smooth transitions and powerful toe-off, enhancing running efficiency BOOM Fiber Upper: Advanced engineered mesh offers superior breathability while maintaining lightweight structural support GCR Rubber Outsole: High-durability rubber compound provides exceptional grip and 6% improved anti-slip performance on various surfaces Featherlight Construction: Weighs under 200g (single shoe, US 8.5) for unencumbered speed COOLSHELL Technology: Integrated ventilation system keeps feet cool and dry during intense efforts Secure Fit System: Low-top design with padded heel collar and dynamic lacing ensures zero heel slip and precise lockdown Reflective Details: Strategic reflective elements enhance visibility for early morning or evening runs Removable Insole: Customizable fit with EVA insole that can be replaced with orthotics if needed