So I needed to get a replacement. My main problem is I guess I have a narrower foot then these are made for and my toes hang over the front of the shoe and slide to the side. They?re airy and suitable for the warm summer. The extra features, including touch controls are nice, but the touch controls are a bit sensitive. My concerns are of possible failures rather than an actual failure. However, I bought these slippers in a size Large - which is supposed to fit a size 9-10 shoe - and they were perfect. Great speaker for the price. " Cheers! Did NOT appreciate that at all. the sounds are rich with base and music sounding dimensional.