The 9 Inch Exhilarate King Tight Top Pocket Coil Mattress by Rest Therapy. Features 800 innerspring pocket coils at 13 gauge and a comfortable and supportive tight top design. It is a popular choice for back sleepers who prefer firm mattress. It comes conveniently compressed and rolled inside a portable carton for space and transportation efficiency. Simply unfold it and watch it transform into shape, and enjoy total comfort and support while you sleep.