Searching for the best cooling mattress topper? Our True Temp™ plush mattress layer, made with 37.5® Technology, is designed to help with temperature regulation throughout the night by moving heat and humidity away so you sleep at the perfect temperature. Plush fiberfill and soothing cool-touch cover add etra softness to your bed for your most comfortable sleep. Breathable design is compatible with all beds, including our Climate™ Series smart beds.