Active Hybrid MattressProduct Details: React 13" Hybrid Mattress We make sleep comfortable. ActivEdge Technology A reinforced perimeter, made up of narrow diameter Quantum coils, that frames the sides, delivers a consistent sleep surface, and reduces that roll off feeling. Our Pocket Coils Provide an even surface that absorbs partner movement and prevents sleepers from rolling together. Stress Relieved Spring Holds its shape and provides a durable, consistent sleep