These are a more expensive variation on Earth Shoes. I have several pairs of earth shoes and really like them. They are definitely more challenging to walk in - I always feel my calf muscles working harder. My husband has earth shoes, too. He likes the sneakers. They do help posture but unfortunately don't have any magical butt-reducing properties. I doubt the other ones would either. You can get earth shoes on sale for about $50 sometimes. Zappos has them, too which means free returns if they don't fit.