Knox Firm Twin XL Mattress

The Serta Quilted Perfect Sleeper X Knox Firm Mattress combines timeless quilted comfort with modern sleep technology. Its firm surface provides an inviting, cushioned feel, while graphite-infused memory foam actively works to dissipate heat and maintain a cooler sleeping environment throughout the night. The thoughtfully engineered construction delivers responsive support paired with pressure-relieving comfort, making it an excellent choice for side sleepers and those seeking a softer mattress experience. Wake refreshed and rejuvenated with the Perfect Sleeper X's balanced blend of classic comfort and contemporary cooling innovation.