I’ve had good luck with pads by Geekria, their pads for my AKG K550 have been excellent - very close to stock. The HD 280 Pros are closed back so they’re easier to replace pads for compared to open backs which tend to be more sensitive. I would always do a material like-for-like replacement though - leather for leather, or velour for velour. I experimented using synthetic leather for some headphones that came with velour as stock and it decimated the sound. Hope my rambling helped.