I bought a Steady Betty years ago and it's nice. I have the wool mats now and they are nice. Two different products. The Steady Betty is very sturdy with a hard surface on back, the wool mats are flexible. The SB will keep the fabric from moving while it is being pressed so no distortion. I use it for all my bias edges. It's a foam fabric. Honestly if you find the older foam back vinyl it;s the same thing. That stuff is hard to find now and expensive anyway. The wool mat does a great job of keeping pressed blocks and seams flat.