Get the best in supportive comfort and value with the SensorPEDIC 8 in. Firm Dual Layer Gel-Infused Memory Foam Mattress. This mattress-in-a-box features a tight top and a dual layer construction of memory foam that is 100% CertiPUS-US certified. The top layer of proprietary SensorAir gel-infused memory foam is exclusive to SensorPEDIC products and cradles the body while offering cool, pressure-relieving support. The base layer consists of ultra-supportive high density foam to provide durability and anti-sag protection. The non-skid bottom ensures this mattress stays securely in place night after night.