Beware mattress marketing touting the benefits of ‘eco-foam’ or soy-based foam. These so-called green mattresses or plant-based mattresses are still made with petroleum-based polyurethane foam. The difference is that the company throws in a little soy oil (usually less than 20%) so they can call it eco-friendly. These foam mattresses are still highly flammable and riddled with toxic chemicals, including the flame retardants usually required for them to meet federal fire safety standards.