Made for a barefoot-like feel during a run, the Nike Free Run+ 'Cool Grey' sneaker features an ultra-light upper combined with a flexible outsole. Rendered in airy mesh, the shoe is supported by durable, laser-cut overlays. Bold branding hits the lateral, while the minimal heel allows for natural mobility. Plush cushioning and a Nike Free outsole work in tandem for flexible shock absorption. The shoe was designed to be compatible with Nike+, a sensor that was sold separately to track running performance.