Mattress Research
Why Mattresses Sag
Common reasons mattresses develop body impressions or sagging and what construction and support can influence.
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Materials compress over time
Foams and fibers can soften and compress with repeated loading. Coil fatigue, foundation problems and improper support can also contribute.
Sagging versus normal impressions
Warranty definitions vary. A visible impression may need to reach a specified depth before it qualifies as a covered defect.
Reduce avoidable stress
Use a compatible foundation, rotate when the manufacturer allows it and follow care instructions.
Use this when comparing real mattresses
Take the construction principle above and compare it against the manufacturer's current specifications, trial terms and warranty rather than relying on marketing labels alone.