10" Night Therapy Supreme Pillow Top Spring Mattress & Bi-Fold&reg; Box Spring Set &ndash; Full Polyester jacquard cover Pillow top features quilted fiber padding and 1" of super soft foam 7.5" base layer of individual, heavy gauge metal springs wrapped in foam provides durability for increased motion separation Bi-Fold Box Spring Folding Foundation is made from heavy gauge metal featuring maximum edge firmness. No assembly required- remove from box, unfold, and lay your mattress on top.