Serta mattress models include the Perfect Sleeper, iComfort, iSeries and Mattress in a Box. Serta mattresses cost between $399 and $1,599 or more, depending on the model and size you choose.

Serta sent me the mattress to test and the brand’s white ... I have a platform bed with no box spring, and while I’m typically a side sleeper, I occasionally sleep on my back.