[Dream in Comfort] The black and gray king size mattress, with its unique circular pattern, offers a three-dimensional visual effect. Simple yet sophisticated, it balances strength and comfort. With a carefully designed seven-zone support system, each part of your body enjoys perfect, balanced support. Whether you're gaming, watching movies, or taking a nap, the mattress evenly distributes your weight from head to toe, providing long-lasting comfort while enhancing the style and elegance of your bedroom [Comfort That Never Stops] Experience uncompromising comfort with 870 pocket springs and 2cm 25D high-resilience foam, which offer personalized support tailored to your body shape and weight, keeping your spine in its natural curve. Your spine will thank you, as our mattress offers a warm embrace. The spring ventilation system and breathable fabric quickly dissipate heat and moisture, leaving only peace and coolness throughout the night [Undisturbed Deep Sleep] The independent pocket springs and double-reinforced 2.3mm edge springs create a stable sleeping environment. The pocket springs work independently, isolating every subtle shift and sound. The thoughtful design of the reinforced edges firmly prevents edge sagging, ensuring you sleep soundly in tranquility, enjoying undisturbed rest [Safety at Its Best] Our mattresses are committed to being harm-free, gently caring for every inch of your skin. Certified by CertiPUR-US and OEKO, they are free from harmful substances and fiberglass. With 10,000 compression tests, equivalent to 10 years of use, they will not sag. This makes them a reliable companion for young people who depend on their bed for long hours of rest [Worry-Free Experience] Why offer a 10-year warranty and 100-night risk-free trial? Because we have confidence in our product quality and we’re committed to you. If you’re not satisfied, our professional support team is available 24/7, guaranteeing a response within 24 hours. Please note that the mattress requires 3 days to fully expand and reach its optimal comfort after unboxing Susalt 12-inch mattress King size hybrid innerspring mattress is designed with individual springs and a breathable, skin-friendly mattress topper that provides support and comfort for your joints whether you're lying on your side, back or stomach, and also ensures that you'll stay cool and dry throughout your night's sleep. The mattress is CertiPUR-US certified and rigorously quality tested to ensure that it is free of harmful substances and will remain collapse-free for up to 10 years. Individual spring construction provides motion isolation to safeguard the independence of each person in the bed for an unparalleled and peaceful sleep experience. The mattress in a box packaging design allows for easier transport and the mattress fits most bed frames. Make every night's sleep a luxurious and inexpensive treat by choosing this hybrid innerspring mattress.