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Sweet Sleep and Comfortable Support: KOANTTI 10 inch queen size mattresses memory foam mixed with multi-layer foam and independent spring support system ensures that your weight is evenly distributed from head to toe and provides targeted support to fully relax muscles and enjoy a good sleep experience. Breathable and Healthy: The 10-inch hybrid mattress is made of high-density first-class thermal material which is comfortable and breathable and can discharge the steam and sweat from the contact surface between you and the mattress so that you can keep your body comfortable and dry during sleep. The mattresses independent pocket spring system can Enhanced air circulation prevents trapped heat for a cool and comfortable sleep. High-quality Top Sponge: KOANTTI queen size spring mattress is made of high-quality knitted fabric multi-layer high-quality sponge keeps you away from back pain. All memory foam is CertiPUR-US certified and tested to be free of harmful substances. Quiet and Independent Spring: built-in high-quality independent pocket spring and slow rebound sponge which can effectively absorb the noise and vibration caused by turning over during sleep do not disturb your companions and sleep peacefully. The support system consists of hundreds of independent pockets of Composed of spring coils it has excellent shock absorption and elasticity and can effectively adjust the quality of sleep. Worry-Free Guaranteed: Please allow 24 – 72 hours for your mattress to return to its full shape after opening the mattress. Meanwhile KOANTTI Mattress comes with 100-night trial and 10-year support.