[fabio-fi]

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Hey guys, just on the look out for great sounding, super comfy cans that will be worn for 6-10 hours in a row, can be open, closed, whatever, but need good mids/highs, no sibilance, non-fatiguing and the bass should be there, just very tight and not overwhelming. Thanks! (should be around 200-250 GBP)

HD598's. They have the "Right" amount of bass + super comfy. 

 

[GL1TCH3D]

I have te beyer t5p and sometimes they're not that comfortable but I can do 3+ hours easy... I guess I just need to get the right clamp and positioning.

 

[Kukuk]

Beyerdynamic DT770 Pro's.
 
Very, very comfy. I frequently put them through 4+ hours of use, and they never get uncomfortable. They also have a pretty laid-back top end, so their sound lends itself well to long listening sessions.
 
The bass isn't super tight (well, it's pretty tight when amped properly), but I don't find it to be overwhelming. Some folks say they are absolute bass monsters, but I don't hear it. I've heard many headphones that have much more bass.

 

[Tenken615]

Even though Bose Headphones are the greatest SQ wise (they dont sound like trash though, dont get me wrong), they are damnnnnn comfy. my 558's are pretty comfy as well... I just wish they were more portable

 

[misformatt]

The few Bose sets I've tried on have all been very comfortable, but I can't speak for their sound quality.  The AKG K550 and various forms of Beyerdynamic DT770 seem like they might be right up your alley.  

 

[-ToM-]

Beyer DT990s here - most comfortable thing i've ever worn.
 
A mate who's a DJ pointed out his Senn HD25-1-II's are 140grams :O

 

[PixelVandalism]

My friends Koss Porta Pros are comfy :s 
(I kind of posted in the wrong place and just made something up, I can't stand them on my head) 

 

[MattTCG]

Quote:

HD598's. They have the "Right" amount of bass + super comfy. 

"Right" amount of bass is certainly subjective. I would say bass light on the 598's. But they are super comfy though