It's time for me to replace the felt fabric on my design board. I use a sheet of insulation board covered in felt or flannel. (I've used both, and they both work for me, so I look for the best deal I can find-including flannel sheets)
This time it will be felt again.
because I found this at JoAnns:
It's polyester...not acrylic. All the same to me.
2 yards of 72" yardage for only $8 is the best price I've seen in a while.
https://www.joann.com/premium-felt/2109114.html
I think it may be a lighter weight felt this time, not sure, but that will still work.