I have a rather large sized adult head, and this fits me... it's not too tight because the fabric is somewhat elastic and will give a little, so I think it can accommodate a decent range of adult heads.At the time of purchase, this hat cost $5.75. I was shocked at the high level of quality. It is very soft (almost comparable to "Gund" softness, not cheap matted down softness) and it is surprisingly warm. Do I think it will last years and years? I probably won't bet on that. However, it will certainly make it through this Christmas and probably next one, and by then, I can probably swing another $6 to buy another hat. :)I actually bought a second hat at the same time as this one, in hopes that one of the two would work out... the other one was a complete flop AND it cost more!