A really good idea, but ones has a hole.
My foot size is a 9-9.5 in mens.  These fit snug, but not so snug that they feel like they are going to cut off circulation.  They did a fantastic job at holding in moisture and helping hydrate my feet.  I didn't feel comfortable keeping the socks on all night because of how snug they are.  They are sticky enough on the outside that I don't have any concerns walking around in non-carpeted areas.  One sort of gross side effect is that they pick up hair off the floor like crazy.<br /><br />My only complaint is that one of the socks came with a hole in the middle of the bottom of the foot.  So, one sock is only useful for the heel of my foot.  That is the main reason I got these, but it does mean I have to be careful how much hydration material I put in the sock (I don't want it to leak out).<br /><br />Overall I think they are a great solution, much better than my makeshift solution of baggies over my socks.  As long as you get a good pair, without a hole, they are a great solution for hydrating dry feet.
Rating: 4 stars