Hi seekingsleep150,
Unfortunately without knowing the specific model that you owned there really isn’t any way to know which of their current models would be the closest approximation to your old mattress but if you measure the thickness then you would probably be able to identify which of their previous models you owned which would be helpful.
Some of the information in post #2 here may be helpful as well.
It’s possible that the reason your current mattress feels firmer is that your original mattress had softened considerably over the course of 10 years. It’s also possible that your current mattress isn’t a “close enough” equivalent" to your previous mattress and is actually firmer than the mattress you originally owned as well.
I would also keep in mind that different people can also have very different perceptions of firmness and softness compared to others as well and a mattress that feels firm for one person can feel like “medium” for someone else or even “soft” for someone else (or vice versa) depending on their body type, sleeping style, physiology, their frame of reference based on what they are used to, and their individual sensitivity and perceptions. There are also different types of firmness and softness that different people may be sensitive to that can affect how they “rate” a mattress as well (see post #15 here) so different people can also have very different opinions on how two mattresses compare in terms of firmness and some people may rate one mattress as being firmer than another and someone else may rate them the other way around. This is all relative and very subjective and is as much an art as a science.
Having said that … based on your comments and feedback (and regardless of whether it would have been the closest approximation to your old mattress if you were making side by side comparisons when both of them were new) it certainly seems that the Contour Select is too firm for you.
You can see my comments about choosing a firmer mattress first with the intention of adding a softer topper later in post #2 here.
In most cases I would avoid this approach because of the uncertainty involved with making two purchase choices instead of only one and choosing a topper that would be suitable in terms of thickness, firmness, and PPP (Posture and alignment, Pressure relief, and your own Personal preferences) for a specific person on a specific mattress can sometimes be almost as difficult as choosing a mattress that doesn’t need a topper in the first place. I would generally focus on choosing a mattress that is likely to be a suitable match without a topper (unless you can test the combination in person or you are purchasing both online as a “set” that is designed to work together and they both have a good return/exchange policy) and then use the option to add a topper as a “backup” strategy in case your initial choice is too firm and doesn’t turn out as well as you hoped for rather than a “primary” strategy.
If you do decide to try the mattress/topper strategy then if the only issue with a mattress is that it is too firm and there are no soft spots or sagging in the mattress then a good quality topper can certainly be an effective way to add some additional softness, “comfort” and pressure relief to your sleeping system but the only way to know for certain whether a specific mattress/topper combination is a good “match” for both of you in terms of comfort, firmness, and PPP is based on your own careful testing or personal experience on the combination. If you can’t test the combination in person then there will always be always some risk and uncertainty involved in adding a topper because the specifics of the mattress itself along with your own body type, sleeping position, and preferences can affect which specific topper would be a suitable choice on any specific mattress.
There is more information about choosing a topper and a link to the better online sources I’m aware of in post #2 here and the topper guidelines it links to which along with a conversation with a reliable and knowledgeable supplier (that can provide you with good information about how their toppers compare to each other or to other toppers they are familiar with that are available on the market) can help you use your sleeping experience as a reference point and guideline to help you choose the type, thickness, and firmness for a topper that has the least possible risk and the best chance for success. A good exchange/return policy can also reduce the risk of an online topper purchase so I would make sure you are comfortable with the options you have available after a purchase just in case the topper you choose doesn’t turn out as well as you hoped for.
If a mattress/topper combination turns out to be a good “match” for you in terms of “comfort”, firmness, and PPP then having a separate topper does have the advantage of being able to replace just the topper without replacing the entire mattress if it softens or breaks down before the upper foam layers in the mattress (which is very likely because the upper layers of a sleeping system tend to soften or break down before the deeper layers) or if your needs or preferences change over time. A suitable topper can also help extend the useful life of the mattress underneath it because it will absorb some of the compression forces that can soften or break down the top layers of the mattress underneath it over time.
If I was in your shoes I would probably choose a mattress that is the closest possible “match” for you in terms of “comfort”, firmness, and PPP (based on careful testing) out of the options that are available to you and if necessary I would err on the side of choosing slightly too firm rather than too soft because a mattress that is too soft is much more difficult to “fix” than a mattress that is too firm. That way you can sleep on the mattress for a few weeks and use your actual sleeping experience as a guideline and reference point to help you decide whether you need a topper and if you do on the thickness/firmness of the topper that would have the best chance of success.
Phoenix