How durable is this mattress over time?

Built to last, with a durability score of 7.2 and a 10-year warranty. This pillow top firm runs genuine high-density foam over 875 pocketed coils of thick 13.75-gauge steel; the heavy wire resists sag far better than thinner gauges, and high-density foam holds its shape longer. The honest note is that the thin 1.5-inch pillow top will soften before the coil system gives out. It is built in Ontario and delivered flat, not vacuum-compressed.

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