Sleep peacefully on an all-natural chemical and toxin free innerspring mattress, reduces bounce between two sleepers and delivers welcome relief from the aches and pains of traditional mattresses. All Sanya Sleep Products are CertiPUR-US® certified by accredited independent testing laboratories so you can be confident that your mattress is made without formaldehyde, ozone depleters, mercury and other heavy metals, PBDEs, TDCPP or TCEP (”Tris”) flame retardants, and is low on VOC. The mattress comes vacuum-packed and rolled to fit into an easily portable box. It takes 2 to 4 hours for the mattress to expand most of the way and a day to expand fully. Box spring or foundation are optional. Slatted bases should be less than 4" apart.