This is off the dollar rack at Wal Mart so like most everything else it is labeled as remnants of unknown origin or something of the sort. I have plain jane polyester stuff and the feel of the material isn't the same. This has the sheen and slippery feel (both sides) of most stuff I have that I know to be sil-nylon, but then again it also feels very much like a couple of rip-stop nylon pieces I have that have DWR coatings. About the only difference is that it isn't as crinkly as Equinox or Golite sil-nylon, but then again it isn't a lot different on that point than a Kifaru paratarp I have either.