All synthetic foams are not created equal. Optimally we would only carry our plant-based latex, but because the material is expensive and more labor-intensive to build, we offer CertiPUR-US-certified polyurethane foam. It is the cleanest synthetic choice on the market and better than other available polyurethane foams because the material consistently meets updated emissions and durability standards. This material provides a medium-sit and holds it shape for years and years to come, providing comfort and durability.