In reply to TobyA:
From their website :-
"LIMITED Lifetime Warranty
What is covered:
• Your mattress is warrantied for the life of the product against defects in materials and workmanship.
• Should the mattress be found defective under this warranty, Therm-a-Rest, at its option, will repair or replace the mattress. Mattresses older than two years from the date
of manufacture may be replaced with a cosmetically irregular mattress. • Normal wear, puncture, abrasion, misuse, alteration, abuse, or taking apart of the product is not
covered.
• Therm-a-Rest will not be liable for incidental or consequential damages. Some states do not allow this exclusion or limitation of incidental or consequential damages, so
the above limitations may not apply. • Shipping charges to an Authorized Repair Center for a damaged mattress are not covered and are the responsibility of the customer.
Return shipping charges for the repaired mattress are covered.