SOULWIT Ear Pads for Sennheiser HD599/HD598/HD595/HD569/HD560S/Game Zero/G4ME Zero/PC37X/PC38X/PC350/PXC350/PXE350/PC360/HD380/HD380 Pro, Cooling Gel Earpads Cushions - Black

Not sure if you've found what you're looking for since it's been two months. But in my recent purchase for my HD550, which I found out use the same size pads and snap on ring as my PC38X, I found these to feel very similar to the cooler pads. (If you're looking for the warmer feeling pads, I don't know) Soulwit pads on Amazon There's also the Wicked Cushions Freeze which have solid side material which may keep more bass in WC Freeze on Amazon