Give your little one a cozy and comfortable sleep with the Lucid Comfort Collection 7-inch Innerspring Youth Mattress. Perfectly designed to fit in bunk beds, trundle beds, and twin mattresses, this mattress features a composition of felt pad, 1.2" foam, and 5.5" Bonnell springs that provide ultimate support for growing bodies under 70 pounds. The soft one-inch foam layer on top covers the steel coils, offering an extra layer of softness. The sturdy foundation prolongs the life of your mattress, while the fire-resistant barrier ensures the safety of the whole family. This spring mattress in a box takes 24-48 hours to fully expand and comes with a 10-year warranty against any manufacturing defects or workmanship.