Signature Sleep Mattress, Twin Mattress,  6 Inch Hybrid Coil Mattress, Black, Twin The Signature Sleep Essential reversible mattresses feature a 1 inch layer of comfortable foam on the top of the mattress for a soft embracing feel with 5 inches of 13.5 gauge coil mattress springs for a great nights sleep. NOTE: Please allow up to 72 hours for the mattress to fully expand and for any potential odor to dissipate. Signature Sleep mattresses are made with low VOC CertiPUR-US certified foam, free of PBDEs, TDCPP or TCEP ("Tris") flame retardants, ozone depleters, mercury, formaldehyde, lead and heavy metals. Signature Sleep Essential 6 mattresses include a soft quilted jacquard mattress cover and works on multiple surfaces including box spring beds, sofa beds, bunk beds, daybeds, platform beds, trundle beds, and other types of beds. The Signature Sleep Signature Essential mattresses are available in multiple size options including twin mattress and full mattress. The Essential 6 affordable mattress ships compressed, rolled, and vacuum sealed in a single box, to arrive at your door step! Ready for sleep within a few hours.