Find a wide selection of Green Sleep mattresses for sale at Natural Mattress Company VT. Comfort is in their NATURE and it’s all around us. In Green Sleep’s natural rubber, pure wool and organic cotton. In fact, all Green Sleep frames, battings, fillings, and fabrics are made of the cleanest and purest products available on the market today. The perfect blend of materials for creating a pure, non-toxic environment for calm, relaxing sleep.