The Li-Ning JB4 "Thorn" is the fourth signature basketball shoe for NBA star Jimmy Butler, known for its focus on stability, cushioning, and multi-directional grip for guards and wings. The shoe was released on November 29, 2025. 

Key Features and Technology

Cushioning: Features full-length Li-Ning Super BOOM cushioning designed for explosive bounce and soft impact protection. Reviewers note the foam feels responsive and provides good court feel after a few wears.

Support & Stability: Includes a carbon-fiber support plate for torsional rigidity and smoother transitions. Sculpted midsole sidewalls and a secure lacing system lock the foot in place during quick cuts and hard stops. The wide base helps prevent ankle rolls.

Traction: The GCU outsole pattern is designed to provide strong multi-directional grip on both indoor and outdoor court surfaces. Reviewers have praised the "insane" traction.

Materials: The upper is made from a lightweight combination of TPEE and textile for breathable support and long-lasting structure.

Design: The "Thorn" colorway features a silver, black, and purple design with sharp, city-inspired detailing.