[caption id="attachment_852" align="aligncenter" width="501"] Plants used as sources of oils for manufacturing foam[/caption] Natural Plant Oils in Foam Several manufacturers claim that some or all of the foams used in their mattresses are either partially or wholly made from plant oils. Terms used for these are soy foam, plant-based, botanical-oil, natural oils, etc. Plant oils used include those extracted from soy beans, castor beans, canola (rapeseed), palm kernel, coconut, peanuts, and...