Size: California King  • Comfort level: Luxury cushion firm
Construction: Hybrid mattress with memory foam and dual coil systems
Cooling technology: 2 layers of phase-change material (PCM)
Memory foam: 2" copper-infused memory foam
Contouring layer: 3" sculpted body-contouring comfort foam
Support: Pressure-sensitive NanoCoil unit and individually wrapped coil pack
Cover: 4-way stretch knit fabric
Compatibility: Adjustable-base compatible
Foundation/box spring: Sold separately
Setup: Ships compressed in a box; allow up to 48 hours for expansion
Warranty: 10-year non-prorated manufacturer warranty
Origin: Made in USA
Manufacturer status: Discontinued; verify remaining inventory
Why choose the Ashley Sleep Millennium Cushion Firm Gel Memory Foam Hybrid California King Mattress M50751?
The Ashley Millennium Cushion Firm M50751 pairs body-contouring foam with two coil systems, offering a luxury cushion-firm feel without relying entirely on foam for support. Its 2-inch copper-infused memory foam and 3-inch sculpted comfort foam provide layered cushioning, while pressure-sensitive NanoCoils and individually wrapped support coils add responsiveness and underlying stability. Two layers of phase-change material are designed to help manage sleeping-surface temperature. The California King measures 83.5 inches long and 72 inches wide, providing more length but less width than a standard King—a useful distinction for taller sleepers. At 14 inches thick, the mattress requires attention to bedding depth and finished bed height, while adjustable-base compatibility adds setup flexibility.
Note: Purchasing mattress and foundation from two different brands may void warranty; see warranty for details
Foundation/box spring sold separately
Mattress ships in a box; please allow 48 hours for your mattress to fully expand after opening
State recycling fee may apply
Made in USA
How does the Ashley Millennium M50751 California King compare with a standard King for sleeping space?
The Millennium M50751 California King measures 72 inches wide and 83.5 inches long, making it approximately 4 inches narrower and 4 inches longer than a standard King mattress. This provides additional legroom for taller sleepers while giving couples about 36 inches of width per person, compared with 38 inches on a standard King. When comparing larger mattress sizes against bedroom dimensions and available walking space, remember that the outer bed frame can extend beyond the mattress. The M50751 also requires a California King frame and fitted sheets; standard King accessories are not interchangeable.
What do copper-infused memory foam, NanoCoils and PCM cooling add to the Ashley Millennium Cushion Firm M50751?
The M50751 combines 2 inches of copper-infused memory foam, 3 inches of sculpted comfort foam and two phase-change material (PCM) layers. Memory foam conforms to the body, PCM is designed to absorb and release heat, and the pressure-sensitive NanoCoil system adds a responsive support layer above the individually wrapped coil pack. These distinct materials explain how the mattress combines cushioning with its cushion-firm support system. Although latex and memory foam differ in contouring, responsiveness and heat retention, this model lists copper-infused memory foam, not latex. Its temperature-management features are designed to help with warmth, but cannot guarantee a cool sleeping experience.
Can the 14-inch Ashley Millennium M50751 use an adjustable base, and what should I know about delivery?
Yes. Millennium M50751 is adjustable-base compatible. Its 14-inch profile would create an approximate mattress-top height of 26 inches on a support surface 12 inches above the floor, before compression. Choosing an adjustable foundation rather than a conventional stationary bed affects positioning options, support requirements and finished sleeping height. California King fitted sheets should accommodate the mattress depth plus any protector. The foundation is sold separately, and the mattress ships compressed in a box; allow up to 48 hours for expansion.
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