Prepping made installation fairly quick. My insoles, trimmed to Size 8, were a tight fit. Just open the app and touch start for the camera to appear. The memory foam could be a shade thicker but they are very warm and comfy. These run bug so be aware Started to collapse right after the return window closed. I love these wool slippers because I have really, really cold feet and these slippers keep them warm and toasty! It had an off shape, not like the picture but more like a bell. Anyways theyre super tall and super pretty! I really like this earphone.