We’re considering an innerspring mattress to replace our current mattress. The one we have is a Sealy. It has served us well although I’ve come to understand how we can do better. It’s a medium-firm mattress and that’s the firmness we’d like. I’m still doing my research. The content here has been enormously helpful although sometimes overwhelming 
One of the mattresses we’re considering is the Natural Escape. On the company web site, the Cal King dimensions are listed as 71" X 83". I wonder why it’s slightly smaller than the standard Cal King (72" x 84")? An inch isn’t much but I’m concerned that it won’t quite fill out our existing bed frame. I’d love to hear any comments on this.
Thanks!