BEWARE !!! DO NOT SHOP HERE !!False claims and no warranties. We purchased a $2,000 King size Sterns & Foster mattress from Mattress Express and 8 months later this mattress is sagging on both sides, there is a bubble mound in the center that has formed. I am 130 lbs. not large enough to make an indentation. We followed manufacturer's instructions and rotate this mattress as recommended. The owner of Mattress Express, Neal Jackson is the most uncooperative person and downright nasty to deal with. First - they denied my purchase until I provided proof of payment, even though they supposedly keep their own records. Per my repeated requests, they came out 3 days later and brought a homemade "tool" to measure the indentation on both sides - while ignoring the huge "mound" that has formed in the center of this mattress, so large in fact that you can't roll to the middle. The tool was not level while measuring and I get an email stating the permanent sagging on both sides is only 1" deep and it has to be 1 1/2" deep to warranty. OK AGAIN this mattress is only 8 months old. I will follow up with the manufacturer and if no relief I will have to go to court.