Question about Gray Triangular Acoustic Room Pillows

I recently moved and my new audio room is going to need significant acoustic treatment as the ceiling and walls are just plain drywall.  During the move I discovered a box of 10 gray pillows, some square and some triangular, about a foot long and three inches or so thick.  These are not foam, they are covered with a gray fabric and one side has a crinkly texture.  I probably bought these in the "90s and must have forgotten about them.  My question is, which side do you think goes against the wall.  I think these might have been from Michael Green's company.  They no longer have a website.  I assume the company no longer exists.