The mattress we got has a winter and a summer side but as I mentioned before we have to just top to toe it as one side is firm and my side is medium tension - it is good though.
If you do find your mattress is too hard then a topper can work wonders. I've tried memory foam toppers but they go flat really quickly and make me feel too hot. You can get latex mattress toppers and they last longer as they are more resilient and regulate the body temperature better.
Latex in natural, antibacterial( so bed bugs can't live in it) and, unlike memory, foam keeps you cool or at least won't make you over heat - which is rather important when menopausal.
When buying latex you need to go for the better quality Talalay latex as it lasts longer. Dg x