You deserve a comfortable mattress at a comfortable price, that's why we made the SleepInc. 12 in. Hybrid Mattress. SleepInc. hybrid mattresses combine cradling memory foam with traditional innersprings for the ease of a memory foam mattress but with a livelier feel. Experience a great night's sleep with this perfect balance of pressure relieving comfort and responsive support. At SleepInc. we believe in good stuff for fewer dollars and of course, great sleep.