You might be confusing IX for the polyethylene foam that is becoming more popular. IX has 2 layers of scrim sandwiching the poly foam which makes it fairly durable. MacEntyre makes/made his IX quilts with out any type of nylon fabric covering or reinforcement. I made a quilt from IX and climasheild and the IX was very easy to work with and was very tough (although you don't want to run it thru the dryer
).
You do have to get the fit just right with IX whereas Climasheild is a little more forgiving in that arena.
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