Serta Perfect Sleeper X Knox Firm Twin XL Hybrid Mattress - Supportive & Cooling for Back Pain Relief - Ideal for Guest Rooms, Dorms & Small Spaces

Featuring 5 support zones designed for full-body spinal alignment with a combination of supportive coils and 1” Perfect Conform™ Memory Foam. Plus a classic quilted feel that makes for night after night of perfect sleep. Memory foam and cooling upgrades available.

5 support zones designed for full-body alignment

PerfectConform™ Memory Foam -For essential pressure relief

CoolFeel™ System

CertiPUR-US® Certified

Firm - Ideal for stomach and back sleepers with extra support

Designed and Built in USA

Adjustable Friendly

Your new mattress may initially feel firmer than expected. Please allow up to 60 days to acclimate to your new mattress as it naturally adjusts to contour, comfort, and support you best

Premium memory foam is temperature-sensitive; it may feel firmer in cooler temperatures and softer in warmer ones. For your preferred comfort, please allow several hours for your memory foam mattress to adjust to the room’s temperature