Sleep Master 12-Inch Pressure Relief Memory Foam Mattress Set with Bi-Fold Boxspring, Twin Top layer of breathable 1" Cool Foam and a micro fiber layer for added comfort and less heat build up Second layer of 2" heat sensitive memory foam with Green Tea, Charcoal and Natural Renewable Plant Third layer of 3" pressure relief foam eliminates pressure points 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