The Ninja is a very flexible and versatile shoe designed for indoor aerobic workouts. The low cut rugged sock design is a true cross trainer good for use as a running or general fitness shoe. The Ninja outsole features a specially designed stabilizer that extends from the heel up towards the flex area of the vamp. The cradle was designed to support a flying arch which gives the Ninja heel to ball support while allowing twisting motion side to side. The result is an energetic and agile shoe that lives up to its name.