The CertiPur-US certification does not recognize whether a mattress is made of organic materials. Instead, it certifies that a mattress does not contain fire retardants, ozone depleters, plasticizers, phthalates, formaldehyde, or heavy metals such as lead or mercury. CertiPur-US also certifies foams that exhibit low VOC for indoor air quality. This means the CertiPur-US accredits anything, even poly or memory foam, as long as it tests negative for VOC or off-gassing. This ensures that your loved ones are protected from harmful chemicals that can cause sickness.