The inside is lined with a similar material to what they use for their headphone earcups. It holds different sizes which is nice. Turns out it is working fine. Shipped quickly, arrived in great condition and it was a great price. Bought these for my boyfriend and they fit perfect! El envío rapidísimo. I have not tested it in dark conditions extensively, but it shows more detail than any other phones I have had in this price range. I like the case and it?s something decent to protect your AirPods with. My wife loves this waist trainer, biggest thing for her is, she said it?s comfortable and made of good material. When I first got them they were not the dream-worthy fit that everyone raves about but I stuck with them and continued to adjust the straps and wear them on walks in the park near my house until it snowed and I couldn?t anymore.