Instantly upgrade your mattress with the Serta Perfect Sleeper DuoCool Mattress Topper. It's constructed with a cooling gel memory foam inside plus an InstantCool cover outside to give you continuous refreshing comfort for a great night's sleep. The memory foam adapts to your curves for personalized comfort that relieves pressure points while you sleep. This helps prevent tossing and turning and keeps you in deep sleep stages. Sleep peacefully and wake renewed with DuoCool. Adds instant, pressure-relieving comfort to any mattress Premium gel memory foam helps promote proper spinal alignment Cooling gel helps relieve heat for a soothing sleep temperature InstantCool cover instantly relaxes to help you fall asleep Machine washable cover stretches to fit up to 17” deep mattress For all sleep positions – side, stomach, and back Foam is CertiPUR-US® certified for content, emissions, and durability Firmness: medium 10-year limited warranty Domestic Product Specifications 73" L x 52" W x 3" H Material & Care Gel memory foam Spot clean only