Works when it stays in place.
Maybe I have unusually narrow feet, but these are just a little too loose, so it's a pain to keep them in position when putting on socks (when wearing them on bare feet), or putting on shoes (doesn't matter whether they're over the socks or under, putting on shoes pushes them out of place). If you have wider feet, these are probably perfect, as they are quite comfortable when positioned properly.
Rating: 3 stars