So I don't like foam. But Sennheiser has decided that this headphone should have a significant amount of them. Well, okay... Material(s) used: Some perforated cloth thing from Aliexpress. Link: https://www.aliexpress.com/item/1ya...in-dyed-multifunction-sewing/32688887691.html And that's it. Just cut out a piece as big as the foam (or a bit smaller, whichever), and replace the front foam with it. I think the rear foam piece should be left where it is if you haven't taken it out already. Of note, this also seems to be the material they use with the mesh/dust cover of the HD800. Just that HD800 has an extra layer of something like the bird cage cover I posted a while back. The HD650 doesn't seem to need that extra layer. Just this one will do. Pics or it didn't happen: As always, please report back if you get the chance to do this to your HD650. I'd love to hear what folks things. No measurements from me, though I can tell ya it looks quite good.