My unicorn-loving first grader went crazy for these when they arrived. There's thick padding where they touch her ears and the top of her head, and the length of each side is adjustable. I had been a bit concerned about how they would fit, since my daughter's head is larger than average, and hats and helmets have always been a problem. These fit her fine though, and I can adjust them to fit my own head. The sound is clear, but I don't see anywhere to control for volume on the headphones themselves.
I like the way they fold up. I feel like that makes them less likely to get broken if they should be sat on or smashed in a backpack (here's hoping!). I bought these for school, so the fact they light up isn't necessarily a good thing, and I'm thinking of taking the battery out of the ear so she won't get in trouble for turning it on all the time. You can keep the light off, turn it on, or have it flash continually. None of those settings affect the way the headphones work at all.