Mac1 uses high density slow return foam (memory foam?) from MaMaster Carr. I've been looking at the McMaster site for an hour trying to find it. Does anyone have the part number of the foam they use?
Yes. I actually found that page, and the foam he uses is green. It shows all of them as untra soft. I would think it would be stiffer? I wish I knew more about foam. This could get expensive.