Slim Ring, made by a company in Japan, are one size fits all silicone rings that go around your big toes that make you lose weight. This product costs at least $35 but may cost a lot more. The "science" behind this product is that the bump your big toe presses down on changes your stride. Changing your stride changes the muscles that work when you walk and according to the makers, this change in muscle usage is what causes the slimming of the belly and thighs. This product isn't guaranteed to cause weight loss.