The Airpower XR1 has an improved outsole which features a special fin-shaped tread to ensure the very highest degree of slip resistance. It is cut slightly wider than the X1. The XR1 is also fitted with a significantly softer inlay to enhance comfort of wear even further. Unlike the Airpower X1, the toe cap and puncture-resistant sole of the Airpower XR1 are metal free. The XR1 also provides more reliable insulation against the cold and heat. In addition, it features reflective strips to the right and left of the zip fasteners.