Also, the description says that the ring stand "works with magnetic car mount. A lot of extra room even my pros don?t fit perfect. Note: CROCS, IF YOURE LISTENING -- can you make these with a smaller circumference and / or with an adjustable foot opening? Not everyone has the same calf width. Sperry just seems to have consistent quality. In fact, my back started reacting to the stress of standing on them after 30 minute intervals. I am considering buying another pair or two to have on hand in case Skullcandy stops making them. I would say I have used these for about 5 hours and have not had to charge and also have not had any disconnects. I wanted them to stay on her feet, but not tight, so the fit is perfect. I had to jiggle it or replug it in the laptop till I saw the lightning indicator. Usually in sandals or dress shoes this is what size I wear and in tennis shoes or boots its 8 ¹/2 I was actually worried they may be to small but the fit perfect and WOW they are so comfortable!