i have a pair of gk-audio ultraphones that i've been sleeping in most every night for about 12 years.
which says alot considering how many other headphones i've had break on me, if not completely crumble to pieces.
they have sony 7506 drivers, so they sound fine.
despite that they fit really tight, they are incredibly comfortable.
me, i hate it when wearing headphones and tilt my head forward to look down and the headphones slide the eff off the front of my head.
with these, i can't sling my head hard enough to make them budge, much less fall off.
unless you're a sleepwalker, you will wake up with them still on.
the headband has two stainless steel springs (really just curved wires) that i think could probably be stretched open if too tight for comfort.
not cheap though ($220), but a good investment.
you didn't mention what roll you partake in motorsports.
if you mechanic, you'll be interested in knowing that you can take a pair of peltor optime 105's (avg. $25, sony 7506's (avg. $100), some silicone glue, and a soldering iron and make any repair possible.
actually, you could build your own from scratch, except i'm not sure how you'd get the audio wire through the head pad.
a lot of the parts for the 105's and the 7506's are actually availble individually.
i have a pair of each i purchased for spare parts which remain entirely in tact since i have yet to need to use a single piece for repair.
if you partake in motorsports as a spectator, hey, they look just like most of what the people with pit passes are wearing.
and you're not going to find better hearing protection, either.
i get about 6 months out of the earpads and i've always replaced them myself.
when i first purchased the ultraphones, i was able to find earpads for about $6 a pair, but last time i checked they're about twice that.
i've purchased them from envirosafety, optics planet, and other places too.
gk-audio will recomend that you send them in for them to replace the ear pads.
but seriously, all you have to do is be really careful the first time you replace them, as they use silicone glue to increase the noise reduction capability.
http://www.gk-music.com/ultraphones.htm