Once expanded, it fits my adult head. It still doesnt lie completely flat. You either like the looks of this think of your dont. Turns out that doesnt work nearly as well as something like this. It doesnt always respond 100% of the time and it can take me a couple of tries before I touch it correctly and in the right place. Also, the headphones are very loose on my head and slip off . And hard to get on and off. For $17 you cant beat the sound, convenience, and service. So, I will NEVER order from this company again, even though the look of the product is great. Secondo me sennheiser non deve produrre prodotti sotto un certo prezzo, perché giustamente non vuole risparmiare sulla qualità e la fedeltà dei driver ma va purtroppo a risparmiare sul resto.