Materials and construction are good, with your standard range of adjustability. Needed to fit within a space for length, width & height. These slippers are a great value. Nothing grown up about it. But I have a desk job and they work just fine for my needs. And it connects with your Bluetooth devices too, if you want to play music from some other source. Sending me straps for free as courtesy so I have spares and took my number to look into the fat bike matter. Great shoe for toddlers. Perhaps they are using a new supplier, but twice Ive ordered shoes and they are muchtoo large. They were perfect for that.