I travel a lot, so I know! The entire inside of the shoe is made of Croslite, the classic Croc material. I could also say "answer" and the call would be answered. But they sound really good once you get your EQ settings dialed in. These are cheap and do a fine job at what theyre intended to do. They even have the fish print on the bottoms and 3D fins on the sides I can use the top one for boots and the bottom one for shoes. I am slightly disappointed that the print is so faded; was hoping for something more vibrant and the material is on the thin side. If one does not have the money, one needs the patience to wait a few seconds for the screen to rotate. It stays very secure during riding, and my daughter has no complaints.