One new trend in all bedding is to speak about organic memory foam or green memory foam. While there are ways to make memory foam more environmentally friendly (Biogreen® Memory Foam is one such example), for memory foam to have the same type of visco-elastic feel and support as the original NASA developed formulation it cannot be organic or soy-based (usually 5-10 % soy can be added to memory foam), nor can it be all-natural. However, the memory foam made in the United States has been shown to be safe and non-toxic, and some manufacturers have gone one step further to reduce or eliminate V.O.C. off-gassing odors and other borderline chemical additives.