Get a good night's sleep with the 8" King Mattress, KATS8, designed with comfort in mind. Featuring an integrated Bonnell spring system that combines the classic buoyancy of steel springs with a luxurious 0.4" cushioning foam layer, this mattress is supportive and plush. Enhancing comfort, KATS8 boasts two felt liners, one placed above the springs and one below, to evenly distribute weight and relieve pressure on hips, back, and shoulders. Complete with a gray fabric fire-resistant barrier that has been tested to ensure it meets safety standards, the KATS8 King Mattress is perfect for all bedrooms. Shipped conveniently compressed and rolled within a portable box for straightforward delivery and setup, it typically takes 2 to 3 hours for the mattress to fully expand. This mattress comes backed by a 10-year warranty. Box spring or foundation is optional.