LAY-FOMM 60 is the newest innovation from the creator of LAYBRICK, LAYWOO-D3, and BendLay. LAY-FOMM 60 is a foamy material and is highly porous. LAY-FOMM 60 is part rubber-elastomeric polymer and part PVA. Once you rinse this material in water only the rubber polymer remains as your micro-porous and flexible object. LAY-FOMM 60 is slightly firmer than LAY-FOMM 40.
Please read this article in 3ders.org for getting some backround.