[Livestrong.com] "Urethane foam is everywhere — it's under your carpet, in your furniture and your bed, in your walls, on the soles of your shoes and in your athletic helmet. Prolonged exposure to petroleum-based chemicals in products like urethane foam may affect the nervous and immune system and cause illnesses including cancer, neurological disorders, autoimmune weakness, asthma and allergies, infertility, miscarriage and child behavior disorders. Although chemicals in urethane foam are required by the U.S. Environmental Protection Agency to be tested for major health effects, the tests do not assess subtle neurological damage to the brain or effects on the a developing fetus, according to Chem-Tox.com."

Read more:

https://www.livestrong.com/article/297783-urethane-foam-health-effects/