They work for me.
Purchased these to go in to a pair of 'hey dude' slip-ons because my toes would get a little sweaty in them and I didn't like that. The lip on the back of the shoes were not tall enough to to keep them from slipping out of place but I fixed it with a little piece of double sided tape. Took a minute to get use to the feeling/texture but it's all good now.
Rating: 5 stars