Did you mean resin treated?
Is this it?
http://www.createforless.com/Fairfi...743.aspx?utm_source=googlebase&utm_medium=cse
From google...
A fabric that has been treated with a synthetic film-forming polymer (resin). This may be done to make the fabric firmer, heavier, more stable, to add wrinkle resistance, to reduce shrinkage or to create surface effect such as embossing or glazing.
A finishing process associated with the application of synthetic chemical compounds to the fabric to provide wrinkle-resistance, wash-and-wear characteristics, or an improved hand.
From what I read this also makes the fibers water resistant which in some cases can mean formaldehyde was used in the process. It should say if it contains that on the label though. I think I would get something not resin treated simply because water will likely move through it quickly and it won't be as effective. Its only $4 a bag. Not worth the risk IMO.
I never used the batting sheets. I always used the loose poly-fil. Mine was made by Morning Glory. Also, the poly materials sometimes come in a flame resistant version which you don't want. This is one time where the warning FLAMMABLE! is a good thing.