No brainer but for space challenged folks like me keeping a 4x8 sheet of foam is a hassle. That is unless you cut it up into tiles and then put them back together for a cut. Blue tape keeps them from moving and it all seems to work nicely. I have to admit that once I used foam it was a big "duh" moment for me. I guess I was waiting for Festool to make a big green sheet of special "Festool" foam for me to spend foolishly on.