I don't need polyester, rayon, dacron, and nylon in my
compost.
Fuel
It'll light up easy, bit not likely to last.
Insulation
This is a handy use. Needs to be kept dry-the natural fibers will decay. There may be some bugs attracted to it as a
feed source. Because it will burn readily, I would not use it to insulate my home, but there are plenty of uses:
chicken coop, greenhouse, around a thermal storage tank.
Filling
How about a dog bed? Stuffed animals/dolls/craft items. Padding for chairs, bench cushions. Sew it up make a draft stopper