by Quick answer: To file a Casper warranty claim, photograph the sag using a taut string across the indentation to prove it exceeds 1 inch, save your original purchase date, and submit the claim through Casper's official warranty page. Casper's mattress warranty runs 10 years for the original owner.
By the MattressNut editorial team · Updated June 2026
Casper's Warranty Explained
Per the brand's stated policy, Casper warrants its mattresses against defects in materials and workmanship for 10 years from purchase, for the original owner using the bed on a supportive base. Trade or commercial purchases carry a shorter term. The warranty covers qualifying sag, split or cracked foam, and cover/zipper defects.
Third-party sources disagree on whether Casper's coverage is prorated, with some describing full replacement throughout and others suggesting a shift toward repair over time. The official language we reviewed does not lay out a proration schedule, so confirm that detail on Casper's official warranty page.
Key Terms (what we could verify)
| Item | Detail |
|---|---|
| Warranty length | 10 years for the original purchaser (shorter for trade/commercial) |
| Sag threshold covered | Visible indentation greater than 1 inch, not caused by an improper base |
| Who pays shipping/transport | Per the brand's policy, approved claims include free return shipping |
| Common exclusions | Stains, tears, burns, cuts, normal softening, comfort preference, improper foundation, non-original owners |
| How to start | Submit photos and proof of purchase via Casper's official warranty page |
How to File / What to Do
Clear the mattress completely. Stretch a string tight across the indentation so it touches the high points on each side and hovers over the deepest dip, then measure and photograph the gap to show it exceeds 1 inch. Photograph the full mattress, any split foam or cover defect, and your foundation. Find your original purchase date, which Casper requires as proof. Submit everything through Casper's official warranty page; owners report a review window of roughly 5 to 10 business days. Use only the contact listed on Casper's official warranty page, and never remove the mattress law tag, since it is treated as proof of an authorized purchase.
Common Problems Owners Report
Owners report that stains, cuts, and burns are the fastest path to denial, because Casper treats them as misuse rather than defects. Sag claims under the 1-inch line are rejected as normal wear, and claims tied to a slatted frame with gaps wider than the brand's stated spacing get pushed back as an unsupportive base. A common surprise: a softer feel alone, without measurable indentation, is considered comfort preference and is not covered.
The Saatva Comparison
Casper's 10-year term is industry-standard; Saatva goes further. The Saatva Classic carries a lifetime warranty and a 365-night home trial versus a typical 100-night window. Free white-glove delivery sets the bed up on a proper base, which sidesteps the "wrong foundation" denial that trips up many foam-mattress claims. If you change your mind in the trial, the return is a flat $99 rather than wrestling a bed back into a box.
See the Saatva Classic warranty & trial
Bottom Line
A Casper claim succeeds when you can prove a 1-inch-plus sag on a compliant base, with a clean mattress and your purchase date on hand. Get the proration detail confirmed in writing before you assume free replacement late in the term.
Bottom line: Measure a 1"+ sag with a string and ruler, keep the mattress clean and the tag intact, and file through Casper's official warranty page with your purchase date.
Related: our full Saatva mattress review.