These are well made and a great idea, but my daughter (who is an active crawler) doesn't keep them on for very long. They fit ok, but just don't seem to stay in place. I ordered the larger ones, which is the right size - any smaller and they would cut off circulation. They do work great to protect the knee and prevent carpet burn, I just have to laugh when my daughter goes on a speed crawl through the house and the Kneekers get left behind.