Several plane rides ahead - which noise canceling headset to buy?

[will2000]

[quote M A V I C]How big is your head? Seriously. I have a pair of Sennheisers but apparently my head isn't big enough to put a lot of pressure on the headphones. In other words, if I push on the slightly they fully cancel the sound, but otherwise just most of it.

My hat size is around XL. Don't headphones have a way to adjust them to your head?