Besides the fact that they’re just cool, one of the reasons I bought these is because other reviewers said the sizes ran big, and that’s what I need. I bought the largest they have (10/11 or 11/12 if I remember correctly) and they fit my big feet just right. They are as soft as advertised and are well made. I wear slippers indoors so they get a lot of wear. I’ve only had them a week but I think they’re going to last a good long time. They came with the shark fin attached, but I switched to the anglerfish immediately. The glow in the dark really glows, and it doesn’t take much to charge them up. Just wearing them with the lights on does it. If you want them supercharged put them in sunlight. A few minutes is all you need. I mentioned they big, but not unwieldy. They don’t get in the way of anything. They’re slippers, not shoe boxes. I’d buy them again.