I was looking around for a reliable foam replacement and boy did I get it. The two pack came in a smaller box; they were folded but two old college books overnight straightened them out without too much issue. They cut super easy with a cheap hobby store foam cutter but are tough enough that they aren't going to just fall apart if you use them. (I tried to twist and rip a piece just to do a small test, and it was very durable, didn't end up being able to rip it apart without being excessive to it.)
All in all, I am very happy with my purchase and plan to buy more of these in the future.