Personally, I believe that the design feature is cool and unique. Often described by users as a waterfall in some headsets or wind. I LOVE the look and design of the shoe, but the shoe is narrow, even the wide ones. The sound quality is nice at well. I used the 2 different size charts and measured foot exactly to the correct CM. This is particularly odd because I bought these as a replacement to my JBL reflect minis which have lasted me a very long time. They seem to be made of plastic! due to hard sole, your feet dont sink in, instead they enlarge due to upper pressure from your body against hard sole, Got this speaker to have in the garage to listing to music while working on vehicles. I believe these slippers are made with the same "real" wool as the others I have bought over the last 10 years.