I was worried at first, but then realized because of the noise canceling qualities, the sound didnt need to be as high. The area for the heel and achilles wear out extremely quick compared to rest of the shoe. probably the most comfortable sandal I have ever used (or tried on for that matter). Out of all the similar designs, this was the only one that had the correct circle camera lense cutout for the iPad Air 3 and also precision cutout for the speakers and ports. Also purchased the Bitly compression socks and think the combination of both have made a difference. After wearing for one day, they are comfortable. Ha sido todo un acierto, ya que me quedan perfectas y son muy cómodasLa suela no se escurre nada y por dentro son como de pelito, mantienen los pies muy calentitos. We get to our destination and everything in our bag is SOAKED. I wanted to love these, but after an hour I decided to return them. Material environmental protection no smell, color is also very positive, no chromatic aberration will not turn yellow.