So if you use them in conjunction with the case, you are going to have remove and replace them every time they go in our out of the case. 5 and the 8 fit well. Good quality, great fit. They cushion my feet and seem better than New Balance that I am suppose to wear. I haven?t washed them yet but I?m sure they would do great. Use:The instructions cover it but it really is simple, plug in and then attach either microphone, headphones or both into their respective ports. Open and close the tiny charging case and va-la, its connected 10-10 for connecting. I recommend this film as it is not only excellent but also is educational. However, one of my cables (the 2m one) has started to break (disconnecting randomly) after just 1 week of usage. The shoes are very uncomfortable.