Serta Perfect Sleeper Cobalt Calm Extra Firm 12" Twin XL Mattress

Featuring a three-zoned coil design, this mattress offers pressure relief and support where you need it, with a Cool Twist® Gel Memory Foam that contours to your body-with upgrades available with more cooling layers and support. Serta® Serta Perfect Sleeper Cobalt Calm Extra Firm 12" Twin XL Mattress