An ample 4 inches of medium-firm polyurethane foam supports a 1 inch layer of spongy soft memory foam for an ideal balance between supple body support and rich softness to send even light sleepers into dreamland without clunky springs or bed frames to creak or poke. for an unexpected sleep over guest, camping and traveling. Wherever you go and whatever you do, use the Tri-Fold Mattress for the sleep you love. Our design has you in mind, so you know your mattress is just right the first time, every time.