The cover of the insole is leather. I now exclusively wear Vionic dress flats. I am not one that goes in for miracle creams however that is exactly what this stuff is! best if you hardwire cause it has no battery for times you not in the car , to use motion detection. Thats a great idea! I usually have issues with any type of flats pinching my toes or rubbing my feet, but so far thats not the case with these. And Im not one of those people who cares *that* much about sound quality. These girls are the true heirs to the throne of solaria but they do not want it, they just want to learn their powers and get their inheritance to have a better life for themselves unfortunately thats not possible when they are a direct threat to the 4 heirs who are set to rule as joint council members. Then I worked the center to join the wires. just a simple wipe and your good to go the next day, good value for money.