Affordable chair covers

I’m tired of fixing and putting varnish on our dining chairs that is why it look like there’s a catfight that happened. I also need durable table napkins. Help me find one. I found out about this site, but I also need more options. Thanks.

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Are these good for low slope roofing?
What do we use for flashings?
Is it secured with adhesives or fasteners?
What is the fire rating?
What about wind uplift?
What type of material warranty is available?
Do we need to be certified by the manufacturer for a warranty?

So many unanswered questions…