Hi Lively -- Thanks for your good question. A few key things to know here:

1) Unless you are bedridden or have a condition that makes you extremely prone to bed sores and the like, pressure relief is not really relevant to back sleeping -- it is only relevant to side sleeping. So any time you see a pressure map of someone on their back, this is either just marketing or a sign that the person assessing the mattress is a fake expert.

2) In any sleep position, you do need to worry about proper spinal alignment, which generally means holding your spine in the same position it's in when you're standing. This is where the lower back issues get addressed. No mattress can do this equally well for everyone, so finding good spinal alignment is about finding a mattress that does this well for you is about finding one that matches your body -- especially in terms of your weight and preferred sleep position(s). In each of our reviews, we assess this factor for each permutation of weight and sleep position and provide clear guidance on how good you can expect the spinal alignment to be for your weight and sleep position(s).

3) Neck issues are almost always connected to your pillow. More specifically, they relate to the interaction between your body, your mattress, and your pillow. Your pillow's job is to fill the space between your mattress and your head as exactly as possible. If it is too tall or not tall enough, this will lead to neck pain. The trick is that the amount of space between your head and the mattress will vary depending on which sleep position you're in AND what mattress you're on. So a pillow that works great for you on one mattress could be terrible for you on another mattress.

Here is some more information about finding a mattress that will be a good match for you in terms of spinal alignment and pressure relief, which are the two considerations we call Mattress "Fit": https://www.goodbed.com/guides/mattress-matching/fit/

And here is some information that explains how Mattress "Fit" fits in with the other characteristics you need to consider when choosing a mattress, which are "Feel" and "Features." Together, we call these considerations "The 3 F's": https://www.goodbed.com/guides/mattress-matching/

I hope that's helpful.