Puffiest Poly Batting?
 

I'm looking for extra thick, super puffy, poly batting. I'm going to use it to recover my furniture cushions for an over-stuffed look. I rarely buy poly, so I'm not familiar with the different grades. Any tips?

I have never refinished furniture cushions but I did a search for "upholstery batting" and found they have some a Walmart, Amazon, etc.

That would probably be the best. Upholstery batting, regular poly batting may be too soft and smash down too quickly.