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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; Soft.

Modular coil suspension units let you adjust the firmness on one side of your M3 mattress, updating comfort without replacing the whole mattress.

Coil suspension units update one side of your M3 mattress to a medium firm feel (Queen). Adjust support as preferences change without replacing the entire mattress.

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.