Bought a new mattress. After 18 years (Simmons firm) and a sore back it's time. Funny, it used to be that for your back they recommended a firm mattress.
Now it's just the opposite. π They now say a Plush (softer) mattress is better for backs and for side sleepers and back sleepers.
This past weekend I worked up a sweat lying on the different mattresses. lol They all felt fine to me. Ended up getting a Serta Perfect Sleeper Luminous Plush Pillow Top. Had a good sale at Macy's. Cost was $1347.00 and they gave us an adjustable base.
This mattress is 17.5 inches and has foam this and gel that and this type of springs and cool this and that blah, blah blah. It felt like laying on a cloud. Supposed to get it in three weeks.