Ethylene Vinyl Acetate sole Equipped with a knob button, the tightness can be adjusted at any time, and it can be quickly adjusted to a comfortable state by rotating and fine adjusting The sole is tough and flexible, soft and easy to bend, fitting the foot to improve flexibility The insole selects EVA foam, more breathable, cushioned and lighter comparing with other common insole. Breathable mesh upper will keep children away from the foot smelly. Perfect for a variety of workouts in and out of the gym,school,playing,travel,jogging,running,every day walk-around etc