WC Freeze PC38X - Cooling Gel Earpads for Sennheiser PC38X / PC37X / HD599 / HD598/ HD560S / Game ONE & More, Made by Wicked Cushions - Elevate Comfort, Durability, & Sound | 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