What does the 10-year warranty cover, and what can void it?
The 10-year warranty stands behind the structure - the pocketed-coil support core that keeps carrying the load long after the surface breaks in - and because NM is National Mattress's own Ontario-built house line, claims are handled in-store rather than through a distant manufacturer's hotline. To keep coverage intact: use a mattress protector from day one, spot-clean only with mild detergent, and never remove the cover; it is not designed to come off.
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