These are good for toddlers that are a little farther along in the potty training experience.  I had bought these for my daughter when we decided to start potty training her because we figured they would be a lot easier to take off and put on than a regular diaper, which they are.  The only problem was, when she peed in the diaper, it would sag and fall down.  There were several times that we would be at the store and her diaper and pants would fall down because she went in her diaper and not the potty.