Puma Kwik Flip - You can flip it from one shoe to another quickly, and it is a flip-flop made for active people. The name is kind of a play on what the shoe is.
I developed it for women who go to the gym and participate in fitness classes, like yoga. They could wear it as a flip-flop to the gym, then change it to a light workout shoe, then back to a flip-flop to hit the sauna. I've seen many people walk into the gym in flip-flops only to cahange into workout shoes, then back into flip-flops. The shoe features a snapping and strapping shroud that velcroes across the back of the heel and snaps on the forefoot. The pods that are on the outsole of the flip-flop protrude to form "pegs" that lock into the inside of the shroud to create a stable base.
Also, the shoe would come with a sock like the one that came with the Nike Rift running shoes, so you could wear the sock with it when it is being worn as a light workout shoe.