Only flying is better! With its high upper and outstanding cushioning Vibram® Mars sole, the Sky GTX ensures high levels of security and protection against twisting an ankle during take-offs and landings. The sure-grip tread provides good traction on different types of terrain. And the turf cleats and waterproof GORE-TEX lining mean that wet, grassy mountain terrain is no problem either. In addition, the membrane helps prevent your toes from getting damp and cold at higher altitudes on longer flights.