Are you a hot sleeper but need a nice firm mattress? The Serta Arctic Premier memory foam California king mattress is here to solve the problem! This mattress has loads of cooling technology that help to draw heat away from your body and down into the mattress, keeping you comfortably cool. You’ll also find the perfect support that Serta is known for - so you get the best of everything. A mattress that keeps you comfortable in every single way. Reactex System Sertas exclusive Reactex System consists of three layers of cooling technology. Each cooling layer increase the cooling capacity more than the previous layer, heat is absorbed away from your body and deeper into the mattress. The result is cool, comfortable sleep all night long. Peak Support Ultra HD Memory Foam Premium, ultra-high-density memory foam provides steady support, so you dont sink too far into your mattress. CustomFit HD Memory Foam Premium, high density memory foam conforms to your body for comfortable support all night long. This foam is unmatched in quality and will keep the mattress feeling newer for a longer period of time. Serta Foam Core The Serta Foam Core provides durable support for any sleep position. With consistent support from edge to edge, youll be comfortably supported all night long. Quilt Layers: Reactex Polyethelene Stretch Knit infused with Arctic P.C.M. cooling technology. FireBlocker Reactex Cooling liner infused with even more Arctic P.C.M. cooling technology. Reactex Cooling Foam with the the highest concentration of Arctic P.C.M. cooling technology. Comfort Layers: Reactex System - 3 layers of Cooling Technology Peak Support Ultra HD Memory Foam Custom Fit HD 6.5lb Memory Foam Serta Balance Support Foam DeepReaction Max Gel Memory Foam Support System: Serta HD Solid Support Foam Core