The Reebok RunTone shoes feature air-filled pods with moving air all along the sole and heel.
This gives a bit of instability with each step, like stepping on a fitness disk.
The instability is designed to activate and tone more muscles.
Unlike many toning shoes, they are relatively lightweight, flat and flexible, all of which make them more suitable to walking and running than most other toning shoe designs.
They flex in the right places and you can get a proper roll through a walking step with them.