The warranty explains that theese are not designed for people over 250 lbs.
I am not 200 lbs & my wife is not near that, however in just 4 years i must kick this mattress to the curb. They have sagged so bad that we each sleep in what we call our own bowls, and if we want to cuddle someone has to lay on what we call the ridge in the middle of the bed. This king size piece of crap set me back $3200 and only lasted 4 years. the only good review is by someone who hasn't had it that long yet, give it time! Don't buy, don't be as sorry as we are.