Extremely comfortable. Great arch support which is unusual.  Foot just rolls with this support and then feel cushion overall.  Fits well with strap.  Definitely use after extensive exercise such as hours of tennis.  Feet are usually quite dead and only want comfort.  Did not want something that fits between toes as I don't want my feet to grip anything.  Want total relaxation.  Will use other times as well.  Can use these with socks.  Fit is true to size.  Had originally ordered a size down based on recommendation and that I have narrow feet (11B).  Sandals (without toe hold) often end up being too large for me since strap is for wider feet.  These fit well.