Serta Perfect Sleeper Plush 12.5" delivers cooling comfort and targeted Zoned support for restful sleep. Featuring our Q4 Support System, 860 4-in-1 coils that are perfectly linked for even weight distribution and stable support. Serta Comfort Foam and Comfort Gel Memory Foam help relieve pressure points and ease aches and pains for all-night alignment, making this mattress ideal for side sleepers. PillowSoft Aire foam offers enhanced cushioning for exceptional comfort while promoting airflow. A layer of CoolTwist Gel Foam provides contouring comfort, heat dissipation, and improved breathability. Stay cool and comfortable with CoolFeel Fabric engineered with cooling performance technologies. The Perfect Sleeper with Q4 Support System delivers balanced, breathable, and lasting comfort at a great value-for perfect sleep, night after night. Serta StabL-Base 9" foundations provide the perfect support for your Serta mattress and are designed to provide durability and long-lasting comfort. Pairing the matching foundation to your Serta mattress will support it for the life of your mattress and help isolate the effect of your partner's movements. Serta StabL-Base foundations meet or exceed Federal Fire Retardancy Standards when used with a compatible Serta mattress. Set includes mattress plus box spring/foundation/base. Larger size mattress sets may feature 2-piece side-by-side foundations for easier navigation in tight spaces.