I was in Walmart yesterday and found what looked and felt like a bolt of silnylon. Upon doing the "breath test", it seemed like you could force some air through it, but it was very difficult.
As I said, it had about the same hand as sil, but since air could be forced through, it obviously wasn't silnylon. I compared it to some light 1.1 oz uncoated ripstop they had in stock (it was a jackpot day) and in comparison it seemed to have some sort of coating on it (given it's shiny appearance), or perhaps it was just calendared? If it's not silnylon, in all likelihood what is it?
It was very light, and