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Simmons Beautyrest Black X-Class Hybrid Medium Queen Mattress - 700810873-1050 4858 Flash Sync ModesA seamless integration of luxury and sleep technology. Distinctive appearance. Highly sophisticated hybrid engineering. Unparalleled cooling and comfort. World's Premier Support System. Tripled. T3 Pocketed Coil Technology; found only in Beautyrest Black; is three steel strands wound into one coil to absorb energy; reduce motion and provide exceptional resilience for support; durability and undisturbed sleep. Feel Cooler; Sleep Better Our most