Bought a king 3 years ago. After a year, noticed our mattress started to form depressions where we each sleep, with a small peak between us (the kings ridge). This was a 5 year old mattress, but was high quality, coil. Figured it was the mattress, so we bought a new one. Same problem. My wife and I are both slim, I weigh 175 lbs, she weighs 120 lbs. The new mattress is only 6 months old. I have always had box springs in the past as opposed to slats. When you get under the bed you can see the flex of the slats.
Slats are not sturdy, causes sagging
Bought a king 3 years ago. After a year, noticed our mattress started to form depressions where we each sleep, with a small peak between us (the kings ridge). This was a 5 year old mattress, but was high quality, coil. Figured it was the mattress, so we bought a new one. Same problem. My wife and I are both slim, I weigh 175 lbs, she weighs 120 lbs. The new mattress is only 6 months old. I have always had box springs in the past as opposed to slats. When you get under the bed you can see the flex of the slats.