Shape Core Sneakers BEAXIS Material: Upper: Polyester, PVC, Nylon Outsole: Synthetic sole M (23.5cm-24.0cm) These sneakers, featuring an unstable rocker sole and a patented insole, are perfect for core training. Just by wearing and walking in them, you can improve your posture and engage in core-strengthening exercises. They are lightweight and soft, making them easy to wear and gentle on your body, allowing you to start training easily. Recommended for busy people who don't have time to exercise! I tried them on once. They will be shipped in their original box.