The Serene Medium Euro Top Mattress by Serta combines adaptive support with cooling comfort for a restful night’s sleep. Its 1100 3-Zoned coil system provides balanced support across the entire surface, while 4.5" of gel comfort foams contour to your body and relieve tension. CoolFeel™ fabric, Serta® Silk Gel Fibre, and breathable gel foams work together to pull away heat, keeping you comfortably cool all night. Adjustable base friendly and crafted with CertiPUR-US® certified foams, this mattress is designed for lasting comfort and performance.