Linn users, what is your preference for your platter mat?

I am a recent purchaser of a Linn LP12. It's an older version, has Cirkus bearing and I think the first Lingo version. Has Ekos arm. Came with Linn Karma cartridge, which is also quite old. I am listening to it and am very pleased so far. The mat that came with it is black felt and looks new. Is there anything wrong with these felt mats? Had the same on an AR TT, it got old and frayed so replaced with a rubber one but it seems to produce a lot of static. Wondering what other Linn users prefer. Thanks.