I was worried about fitting over tennis shoes, boots, and other shoe types and sizes. But, I'm able to get these to work fine. Just cleaned our carpets for $500 due to tracking stuff into the house. With these, I hope to be able to work around the house (inside and out) without having to track stuff in, or taking my shoes/boots off and on all the time. This idea seems to be getting the job done. (they are slightly slippery on tile floors - walk carefully with that in mind and should be fine).