They are very comfortable and do not tire the foot. However, they have a very narrow fit, resulting in discomfort after wearing them for a while. They have a narrow fit and I believe that we need a size larger than what we normally wear. A major negative is the material of the inner sole (that the foot rests on), which becomes very slippery when the foot sweats. Additionally, the sole is excessively slippery. I slipped on marble once and on laminate flooring another time. They are very slippery on marble, tiles, wood, and smooth concrete. I added an additional insole and fixed the slipperiness issue.