I’m tired of those damn box springs. My mattress is just fine, but the springs in the box spring keep giving out, and down I sink. I can’t sleep properly.
Some beds have just a big wooden box under them that’s strong enough to hold up me and my mattress.
Under the “main” mattress you can either have a foundation or a box spring. A foundation is usually a cheaper option and is not as well made as a box spring. Usually any bedding store will carry both.