Signature Sleep Silouette 8 inch Memory Foam Mattress, Twin Soft, knit outer cover 2" high performance memory foam 6" high density foam The Signature Sleep 8" silhouette mattress is made with CertiPUR-US Certified foam. Foam in this mattress is made without PBDEs, TDCPP or TCEP (Tris) flame retardants, ozone depleters, mercury, lead and heavy metals.