Our mattresses are guaranteed for 5 years against any collapse and sagging that may occur. This guarantee is valid as long as your mattress is on a solid and level surface. If you are using a slatted base, the slats should be dense and not more than 4 cm apart. If you overfill the box spring, imbalance on the floor may damage the mattress. Damage caused by spilling hot or acidic liquids on the mattress is not covered by the warranty.