How long will this memory foam mattress last?

It scores 9.2 for durability and carries a 10-year warranty. The comfort foam is genuine high-density foam over a high-density Serta Foam Core, the combination that resists the soft-spot wear that ends cheaper beds early, and with no coils anywhere there is nothing to fatigue or lose tension. Backed by Serta long track record, expect this iComfort to hold its medium feel for the long haul.