If you want a memory foam topper that doesn't break down quickly -- look for higher density memory foams. Ideally 4.0lbs pcf or higher. 5.0lbs is great. I think Plushbeds actually sells a 5.3lb topper which might be the highest. I would avoid any memory foam topper that doesn't list or disclose a density as that probably means it's a low quality foam. Latex foam toppers and serene foam toppers will also tend to be higher quality as well. More on reddit.com

Having given up on mattress shopping (for now), I decided to buy a 3" topper to improve the plushtop hybrid mattress that after 7 years never gave me the softness I wanted. Since I badly wanted softness with a pronounced body contour, I went with a Tempur-Adapt + Cooling Topper. For me, it's an instant hit. It gave my mattress new life, with a feel exactly like the pricy LuxeAdapt Soft I loved in the TP showroom. A lightweight back sleeper, luckily I don't sleep hot. To me, the 3" thickness was enough to give me the hug I wanted. Plus, I bought the topper for 40% off! But for the OP, this TP topper might be too soft. To be sure, check out the LuxeAdapt Soft for a sense of how this topper would feel. More on reddit.com

This is the dilemma with toppers and, unfortunately, there's not a way to know ahead of time. If the mattress is *very* hard you could try a three inch to start. If it's only a little bit hard then I'd try a two inch. But unfortunately, no way to know until you try. More on reddit.com

I LOVE the TEMPUR-Adapt we got last year, my sleep have never been better and also my back hurt much less, wish I have got it years ago lol edit: the specfic one we got is the number 3 here: https://pincara.com/best-mattress-topper/ More on reddit.com