The hearing protection has been in use at my daughter from the fifth / sixth month (now 10 months) and does not fit even my wife with hat size 56. The latter probably permanently comfortable but it illustrates the adaptability of the bracket. I am confident that these protectors grows over the coming years. There will be no excessive pressure and the soundproofing I would compare with earplugs. Surprisingly, our daughter wearing the protectors without objection a long hour, which speaks in my eyes for the comfortable fit, at the same time he is never slipped or similar which in turn would indicate poor fit of self. In short, I am very satisfied and recommend the protectors duchweg on.