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The difference is in the gauge of the coil. The firm is 13 3/4 gauge , the plush is 15 1/2 gauge.
The coil gauge of a mattress measures the thickness of the coils inside. The higher the number, the thinner the coil wire and the softer the coil. Firm mattresses have lower coil gauges than soft mattresses.
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Date published: 2015-04-12