How could you do it to us?????? (lol) No really, lake's yellow is the same porosity but they use a very stiff foam for both rotary and the DA. For the rotary we don't like stiff foam, it causes the pad to bounce and not lie flat which can lead to swirl marks because the operator is forced to put the pad on edge to keep it from bouncing. Our new DA line uses a similar stiff foam we call durafoam which works great for the DA because its not spinning and also the size of the pad being 6 inches makes is too compressable in our "rotary foam".