I bought these because I ride a road bicycle a lot. Many times we stop and do breakfast etc, and you're left to walk in your shoes with the cleats. Well, cleats are $30 to replace and these are easy to roll up and pack in jersey pocket. Need I say more?
I have found several other uses for them: trips, airplanes, etc. Overall, they are a pretty good investment. Compact, easy to use, sturdy. Well worth the $$
The sizing is on the small side of normal. I wear slippers throughout the day when I am at home.