100% Polyester General Note: Please allow 24 - 72 hours for your Mattress to regain its full shape. Any memory foam will expand faster in a warmer room. In cold temperature, at delivery, your mattress may take a bit longer to return to full sized from its compressed state.The expansion time of the mattress will vary as per the surrounding.General Note: Please allow 24 - 72 hours for your Mattress to regain its full shape. Any memory foam will expand faster in a warmer room. In cold temperature, at delivery, your mattress may take a bit longer to return to full sized from its compressed state.The expansion time of the mattress will vary as per the surrounding. 10 inches hybrid combines the traditional support of an innerspring mattress with the plush comfort of hypallergenic memory foam for a medium feel.A thick layer of memory foam conforms to your curves to help eliminate pressure points and increase comfort.Set Up: Simply take your mattress out of the box and enjoy watching it decompress. Jumping, walking, and sleeping on your mattress can speed up the process. Compressed and shipped in a box for convenient delivery and setup, this universally comfortable mattress makes relaxing easy.Base: 6 incheses Tempered Steel Springs and Support Foam Available in a medium firm 8 inches profile, a medium 10 inches profile, or a plush 12 inches profile that also features gel infusions and supportive steel coils Packaging process may leave small brown flecks called carbons in the mattress packaging; these carbons are harmless pieces of plastic and will not stick to your mattress; 10 year limited