VERY slippery sole... like, dangerously slippery! Not particularly comfortable either. I found these to run at least a half size small (surprising, given the open back!). Maybe these would be ok on carpet, but if you have wood floors, steer clear of these. I've worn them for a few days, so I can't return them now... but I'm not even sure if I will wear them, given I am afraid I'm going to slide down my stairs. I guess I'll probably get those sandpaper-like stickers for them - but it's a stupid design flaw.