How do I tell if it is Sil-Polyester or Sil-Nylon? I have about 25-30 yards so I hope it is silnylon and DWR. All three have the grid/squares... two of them are super shiny and slippery (silnylon?). One of them I can breath through a little so I think it is dwr... but how much can you breath through plain ripstop?