Hi latex-researcher,
I’m sorry your new mattress is feeling a bit warm to you. But there are a few things you can take a look at first to see if they make a difference.
In very general terms … the materials, layers, and components of a sleeping system that are closer to your skin will have a bigger effect on airflow, moisture transport, and temperature regulation than materials, layers, and components that are further away from your skin and softer mattresses or foam toppers will tend to be more “insulating” and for some people can sleep warmer than firmer versions of the same material. There is a really good post with more about the many variables that can affect the sleeping temperature of a mattress or sleeping system in post #2 here. I would pay special attention to the mattress pad/protector and fitted sheet that you are using to see if this is negatively affecting your sleeping temperature. It’s amazing how much changing your mattress can make a difference.
Talalay latex (blended or otherwise) is generally the most breathable of foams, followed by Dunlop latex, polyfoam, and then memory foam. The deeper you sink into a mattress, the warmer you may feel, as all foam is an insulator to an extent, so you may feel less warm on a mattress that doesn’t allow you to sink in quite as much, or if you desire latex as your upper comfort surface and you decide to return this mattress after analyzing your mattress pad and sheets, you may wish to investigate a mattress that uses a spring unit with latex on top to offer a bit more air circulation. But the blend wouldn’t have much of an impact upon temperature.
If you end up unfortunately returning your mattress, then there is a good starting point for some research on latex mattresses using innersprings for the support layer in post #2 here.
I’m looking forward to learning if you experience any better results in sleeping temperature after evaluating your top of mattress products.
Phoenix