These may be OK if you can get them on your feet, but they are hard to slip on if you are using something like Lock Laces to keep from having to tie/untie shoes.  It is hard to slide your foot forward in them because of the nature of the material of the inner sole.  It seems like a non skid surface. I also got a good blister on the back of my left foot.  That may be because they weren't on tightly enough because of using elastic laces.  They do feel good when they are on though.  I have to do some more testing.  I won't be using them on any more long runs for the foreseeable future though.