Looking for a medium firmness king sized mattress. Husband and I currently have a C2 sleep number that we despise. Feel that it is too thin and we both have back and shoulder pain. We are both primarily side sleepers. I am 5”8’ and 180 lbs and my husband is 6”4’ and 250 lbs.
Hi Alm10003.
Welcome to our Mattress Forum. 
When you say you feel it’s too thin, do you mean you’re sinking through the layers?
We obviously can point you to a number of medium mattresses, but we wouldn’t be able to say for certain which is the best for you in terms of comfort and support because that comes down to exactly what you personally feel on a said mattress.
What do you like in a mattress? All foam? Hybrid foam + springs? Traditional innerspring?
NikkiTMU
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