Li-Ning Jimmy Butler 4 (JB4)
The Li-Ning Jimmy Butler 4 (JB4) is a top-tier professional basketball shoe released in late 2025. This specific colorway follows the flagship signature line for NBA star Jimmy Butler, engineered for elite performance with a focus on stability and high-rebound cushioning.
Core Technologies
The JB4 is packed with Li-Ning's most advanced performance features:
· Cushioning & Energy Return: Utilizes a full-length Li-Ning "Beng" (BOOM) midsole. According to Shopnings.com, this supercritical fluid foam technology provides a bouncy, responsive feel that is lighter and more durable than traditional materials.
· Carbon Core Drive System: Features a sandwich structure that integrates a carbon fiber plate within the midsole. This system is designed to maximize jump height and provide powerful propulsion.
· Upper Construction: Built with 3-D IBR (Injection Born Rubber) components and BOOM Fiber. This creates a "stiff" but extremely supportive frame that offers "octopus-like" lockdown to prevent foot slippage during sharp cuts.
· Traction: Equipped with a GCU (Ground Control Unit) outsole. Reviewers from the Chasing Perfection channel note its exceptional grip and "squeaky" stopping power, though it is primarily recommended for indoor courts.
Performance Profile
· Weight: While advertised as lightweight at approximately 387g (size 10.5), real-world measurements often place it closer to 418-420g, giving it a "mini tank" feel that prioritizes support over minimal weight.
· Fit & Sizing: Experts from WearTesters and Real Foot Doctor recommend going true to size. However, because of the rigid IBR upper, players with very wide feet may find the toe box slightly restrictive.
· Court Feel: The shoe features a low-profile design with a high-arch support system, making it ideal for aggressive wing players who need stability during high-intensity play.