From the ad:
Single hook-and-loop strap secures a sporty mary jane walking shoe outfitted with a patented Masai Sensor sole that has a soft surface similar to walking on a sandy beach. The natural instability this creates activates the supporting muscle system and conditions the body simply by walking. With continued wear, benefits can include improved circulation and posture; reduced stress and pressure on the back, feet and joints; and an overall toned appearance.
Last time I checked, instability was not desirable in shoes -- sprains and breaks and whatnot. Ew. I mean, this is a perfect shoe if you're a Power Puff Girl Otherwise, not so much.
