The Serta Perfect Sleeper Nurture Night mattress had perfect firmness and really improved my back pain! It doesn't hurt anymore when I wake up like it used to! It's nice and level, and when my partner moves around I can't even feel it! The mattress stays nice and cool all night. It doesn't leave a permanent indentation like my last mattress. I appreciate that it's moisture wicking and non-toxic as well! What a great sleep! I'm so grateful for this new mattress and excited to sleep on it at night!