“Lifetime warranty” sounds like the safest possible promise. In the mattress industry, it often means something more specific and less protective than it appears. Understanding what’s actually covered — and what isn’t — before you buy saves a lot of frustration later.
What mattress warranties actually cover
Most mattress warranties cover two things: manufacturing defects (stitching failures, broken coils, foam that doesn’t meet spec) and sagging beyond a defined threshold. The threshold is the key number. Many warranties only cover sagging of 1.5 inches or more. Others say 1 inch. A mattress that sags 0.9 inches and causes you back pain is not covered.
The practical problem: measuring mattress sag requires the mattress to be on an appropriate foundation, undamaged, and without a cover. Most warranty claims get denied on technicalities — improper foundation, stains, physical damage that “contributed” to the issue. These aren’t bad-faith moves by manufacturers; they’re the fine print people don’t read.
Lifetime vs. 10-year: what the difference means
A 10-year non-prorated warranty is better than a 25-year prorated one. Here’s why: prorated warranties reduce the manufacturer’s coverage over time. At year 11 of a 25-year prorated warranty, you might be responsible for 60% of the replacement cost. At year 15, maybe 80%. The lifetime warranty headline is marketing; the proration schedule is what determines actual value.
Saatva offers a lifetime warranty that’s non-prorated for the first 15 years. That’s genuinely good. DreamCloud offers a lifetime warranty — read the proration schedule carefully before assuming it’s equivalent.
The foundation issue most people miss
Every mattress warranty specifies what foundation types are acceptable. Most foam and hybrid mattresses require slats spaced no more than 3 inches apart, or a solid platform. An old box spring with wide slat spacing or a foundation that flexes can void your warranty entirely — even if the mattress fails for reasons completely unrelated to the foundation.
Before you buy: check that your current bed frame or foundation meets the warranty requirements. It takes five minutes and prevents the most common reason warranty claims get rejected.
The three warranties we actually trust
In our experience: Nectar’s Forever Warranty is the most straightforward — clear terms, 1-inch sag threshold, non-prorated. Saatva’s lifetime warranty is strong for the first 15 years. Helix’s 10-year warranty is honest about what it covers rather than hiding behind a “lifetime” label that’s heavily prorated. These three have the documentation to back up their promises; we’ve seen the claims processes work.