Layered plush softness for all-night relaxation defines this Serta Perfect Sleeper Cascade Range plush pillow-top mattress set, bolstered by the Q4 Support System to distribute weight evenly and prevent sagging over time. Cushion Gel Hd Foam draws heat away from the body, while Pillow Soft Aire foam cushions pressure points. Cool Feel technology keeps the surface consistently cool for deeper, more restorative rest.