The Matthew M. Williams x Wmns Free Trainer 3 Flyknit SP is a technical trainer embodying the multi-functionality of a modern lifestyle, created in partnership with the eponymous British designer. The shoe launched in June 2019, this 'Black' iteration's sock-like bootie utilizes molded overlays, a TPU mudguard and dual straps for structure and containment. Vibram technology within the detachable crampon rubber sole allows for versatility and support on myriad indoor and outdoor surfaces.