These are awesome, my 6yo daughter loves them! She wears a 10 (at the largest) and the 10 was very snug, so I would recommend to definately go to the next size up. They fit like water shoes and aren't easy to get on.  I'm going to order her another pair in a different color (and a size larger!).  The lights are cool-- there is a button she can easily use that has a few different settings of different light displays, and you just press it for about 2-4 seconds to turn the lights off.  This morning she told me the bottoms of the soles even light up, so she was excited about that (I didn't witness this though!).  The charging attachments it came with didn't both work, so I had to charge the shoes one at a time, but that wasn't a big deal. It looks like a standard charger tip anyway, so you probably could charge it with one you already have at home if needed.