By the time a year passed, I noticed that I could only spin this $1100 mattress, I didn't get a full two sides to work with. Good thing I sleep alone! Now, at year 2, the spot I sleep in is sinking where my butt is. I am not a large person, size 10, 5'7" tall, and honestly, have no butt to speak of yet I know exactly where it goes when I sleep. I found this website while looking for info on the warranty. Says it's "10 years FULL." So tomorrow I'll call to see just what that means.