Get total comfort at a cozy price with the SleepInc. 10 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.