>>368545224
I like the polyurethane leather gaskets from vrcover, both for index and old oculus rift. no flaking after thousands of hours of use, just good ol' petrochemicals. 

I also got their silicone gasket and their cotton cloth one, but I just don't like them as much personally. the silicone one gets way too slippery when sweaty and slides down my face, and the cloth one just gets damp.