Premium - Soy Based Organic Foam. For those looking for an organic foam. Ultimate - The highest Soy Based Organic Foam. This foam is green and has a higher resiliency than both our premium and original.  This is truly the best foam on the market.  Please note, even though our foam is non-toxic, it is recommended that you always keep the cover on while your little one is playing. They have teeth that can bite through the foam, potentially causing a choking hazard.