❄️ Sleep smart, stay cool, wake unstoppable.
The Serta Perfect Sleeper X Knox is a 13.5-inch firm hybrid queen mattress featuring a 5-zone coil and memory foam system for targeted spinal alignment and pressure relief. Its graphite-infused cooling technology ensures temperature regulation throughout the night. Certified by CertiPUR-US and backed by a 100-night trial, this mattress is shipped full-size from the USA, combining durability with premium comfort tailored for stomach and back sleepers.
| Material Type | Memory Foam, pocketed coils |
| Fill Material | Pocketed Coils, Memory Foam |
| Product Care Instructions | We do not recommend applying liquids to the product. Applying liquids may stain the fabric and could potentially make the soiled area worse. Moisture or chemicals applied directly to the mattress can cause premature breakdown of the foam and damage the product., To clean your mattress, we suggest applying baking soda to the soiled area and letting it stand for about 15 minutes. Then, vacuum and repeat as needed. It's important that you also air the product out as much as possible., In order to protect your mattress from stains and spills, we recommend using a mattress protector. This will also help with the overall health and lifespan of your mattress. |
| Cover Material | Polyester Blend |
| Item Weight | 78.6 Pounds |
| Item Dimensions L x W x Thickness | 79.5"L x 60"W x 13.5"Th |
| Size | Queen |
| Color | Black |
| Top Style | Tight Top |
| Is Customizable? | No |
| Construction Type | Hybrid |
| Portable | No |
| Is Foldable | No |
| Special Features | Temperature Regulating, Durable, Pressure Relief, Breathable, Low Motion Transfer |
| Item Firmness Description | Firm |
| Number of Layers | 7 |
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