Yeah the 800 pads physically fit on the 820, but stock vs stock, the 820 are thicker. So going with aftermarket 800 pads would be going in the wrong direction for me. I need thicker pads. Sennheiser should really have made the clamping force higher or made it adjustable in some way. All the moveable joints on the 820 (and the 800/800S) are quite loose and floppy. Maybe if everything were just tightened up slightly it would help. But no way of doing that after the fact as far as I can tell. These things were really made for people with wider faces. If anybody offers thicker 820 pads at some point, that will definitely help. That said, these things sound so good right now that I'm willing to stick it out and not return them.