Living Review durability forecast — modeled, not observed
What should age first, and how confident we are
Assumptions: two adults totalling under about 400 lb, nightly use, a solid platform or slats no more than 3.5 in apart, rotation every six months, and no liquid damage. Inputs are the published layer list and NapLab’s teardown thicknesses. No foam density, coil gauge, or Grid material specification is published, so this is a qualitative scenario, not a service-life figure, a failure probability, or a rating.
Modeled first change
The 1-inch polyfoam under the Grid and the foam edge border. Thin, unspecified polyfoam carries concentrated load directly below the hip and softens before the polymer above it or the coils below. The expected early sign is a slightly deeper hip channel and a softer seated edge rather than a visible dip.
Modeled countermeasures
The Grid itself is a resilient elastomer rather than a foam, so it is not expected to take a permanent set the way low-density comfort foam does. An 8-inch pocketed coil unit spreads load across the whole surface. The 1.00-inch warranty threshold means a defect is recognised earlier than under a 1.5-inch rule.
Uncertainty and update rule
Confidence is low to moderate. Missing inputs — foam density, coil gauge, and any long-term test — could move the outlook either way, and the teardown’s remark about lower foam quality points downward. We will revise this section when a current-version lab test is published, if the layer list changes, or if consistent owner reports describe the change above at a specific age.