Cal King modular coil suspension unit lets you update the firmness on one side of the M3 mattress. Refresh feel without replacing the whole mattress; Medium Firm.

Independent suspension units for the M3 mattress let you update the firmness on one side. Split California King, 0.0 Firm; includes enough coils for a single side.

Independent suspension units for the M3 mattress let you update the firmness on one side. Split California King, 3.0 Soft; includes enough coils for a single side.

Split Head Cal King comfort layer for the M3 mattress with modular firmness options and enhanced airflow for breathable comfort. Designed for an individualized feel on each side.