Hi nancymariec,
I noticed that you registered with your email as your username which means that spambots can harvest your email and add you to their spam lists. If you’d like I can remove the @ and the domain after it and change your username to just nancymariec.
This is information that a better retailer should be willing and able to provide you. If they don’t already know then they should be willing to call the factory and find out for you. If they aren’t willing to do this for their customers then you can try and get the information directly from the manufacturer but some of them will only provide this information to their retail stores and not to individual consumers. The information you need to identify any weak links in a mattress and make more meaningful comparisons to other mattresses is in this article.
I’m not sure where you are in Oregon but if you let me know your city or zip code there may be better quality/value options available to you than either an Englander or a Restonic but this will of course depend on the specifics of a mattress you are considering. There is more about the most important parts of the value of a mattress purchase in post #13 here.
Just in case you haven’t already … I would also make sure that you’ve also read the mattress shopping tutorial here which has all the basic information, steps, and guidelines that can help you make the best possible choices … and know how and why to avoid the worst ones.
Phoenix