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

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

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