I sheet of insulation works beautifully. You can push pins into it to hold blocks in place and it is light weight. I even use mine to layer and spray baste small quilts or projects. I inherited mine from my sister-in-law 12 years ago and it was not new then but it is still if fine condition and always has something hanging on it! Worth the investment. I do keep a clothes brush near by to give it a little brush down now and again to remove the little threads. Enjoy your new design wall.