I have become addicted to Realflex shoes. I don't wear anything else if I can help it! I found it difficult to find the original Realflex shoes but came across these Realflex Optimal 3.0 shoes. They are even lighter and more comfortable than the originals! They are very flexable and light. It is like wearing almost nothing. I have already recommended them to my doctor and he loves the pair he bought! Great Shoe!