Featuring a 3-zoned coil design, Serta's Perfect Sleeper Cobalt Calm 13" Plush Mattress offers pressure relief and support where you need it, along with the luxurious feel of Cool Twist Gel Memory Foam that contours to your body.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzes reviews to verify trustworthiness.