A great night’s sleep starts here. The Blue 300 Firm model mattress combines the feel of an extra-firm mattress with the benefits of Serta’s TempActiv™ temperature regulation system. In other words, you will get the support you need without sacrificing comfort. It combines TempActiv™ Gel Memory Foam with a layer of EverCool® Fuze Memory Foam for enhanced cooling comfort that also supports every curve of your body. This will help to eliminate tossing and turning throughout the night. It also features a layer of Deep Reaction™ Memory Foam for a substantial, deep-down feel not often found in traditional mattress. This mattress is finished with Serta’s TempActiv™ Touch Fabric for enhanced cooling comfort.