What is the most comfortable headphones you've worn?

Heya,

The D2000/5000/7000 are crazy comfortable.

Beyers DT/T lines are also crazy comfortable.

Very best,

MDR-XB700 and MDR-XB1000 giant head pillows that assault your head with bass.

DT880 by far

Sennheiser 555 because that's all i got 

Denon.

Beyer 770/880/990

Most has been AD700, followed by Denon D2000.  Beyers follow.

Grado GS1000.

I haven't worn very many headphones, but the Stax Lambda is the most comfortable I've had yet, even outdoing Audio-Technica.

Pads could be a bit better, but taping bits of microfiber cloth over the contact areas helps a lot. Maybe getting some genuine leather pads of the sort found on the SR-404 Limited and SR-507 would also help. (If only Stax had velour pads...)

i find my hifimans more comfortable than both denons i've owned, but i do have a larger than average head, so maybe it's that? also have a strong neck so i don't really notice the weight. Headband in particular is nice, denons would hurt the top of my head after a couple hours.

Sony XB-Series, I do hope them to come out with some more serious headphones in that design

btw k701 was very uncomfortable to me..

STAX SR007.

The leather earpads and the weight distribution is just unrivaled.

The k601 is the most comfortable I've tried. The DT880 is a close second.

In ranked order:

1) Sennheiser HD800

2) Stax SR-007mkII

3) HiFiMAN HE-300

4) HiFiMAN HE-500

5) HiFiMAN HE-6

6) LCD-2

7) 271mkII

8) K702

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89) AKG K26P

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103) Koss Porta Pro

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n) IEM

So simple, yet so complicated. :)