These are great. The only complaint I do have is that ...
Yay!  Finally a pair that is actually double-sided.  I have ordered other non-slip socks/slippers and they usually have the non-skid part just one one-side.  For some reason, socks seem to rotate on my foot.  Probably because I always buy socks that are way too big for me.  I have mostly tile and hardwood floors.  Carpet is only in the bedrooms.  These are great.  The only complaint I do have is that they are on the thin side.  Which is ok for me because I live in Florida.  They keep my feet just warm enough on the 2 days of cold we have a year.  Also, they allow my feet to not get overheated when it's super hot out for the rest of the year.
Rating: 5 stars