Is efabricsupplier's calendered nylon down proof?

Has anyone made a down quilt with their 1.1oz calendered fabrics? If so, is it downproof or did it leak? I'll be using 800 fill down. Thanks

I contacted efabricsupplier with the same question. Go a response from Rachel stating that she was not sure if it was down proof.
How does one go about testing for down proofness? Thinking of maybe ordering 1yd and making a pillow... then throw it around, have a pillow fight, etc and see if it leaks.

I thought that calandered = downproof? "Thought" being the key word.

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Originally Posted by MotoHanger

I thought that calandered = downproof? "Thought" being the key word.

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All downproof = calendared, but all calendared does not = downproof.