Premium leather upper features butterfly design. Hook-and-loop closure with stretch laces for easy on and off. Leather lining and footbed. Sensory Response Technologyâ"¢ helps mimic barefoot walking by having sensory pods on the outsole to help kids feel the ground. Flexible and lightweight outsole helps kids learn to adapt to uneven surfaces. They have a protective sole that is flexible to assist the child in their first steps.