I absolutely love these earplugs, they maintain sound quality, and are nearly invisible. I use them at concerts, yes, but I also am very sensitive to loud noises in general, and these have helped me cope when I get overwhelmed by chaotic or loud noise. The fact that they come with a carry case that I can attach to my keys means that I don't have to worry about losing them, which I am prone to. If you have sensory sensitivities, or your kid does, I very highly recommend these (in addition to concert use). The smallest ears plugs would probably work for most kids - I just have tiny ears!