Unlike memory foam and many polyurethane and synthetic foams, organic latex — which is used in our Avocado Green Mattresses — does not tend to retain heat. At the same time, the organic latex layers we use are located under the organic wool and ticking, so there is no direct contact between the mattress pad heater and latex. So, yes, a mattress pad heater can be used at a low to moderate setting, if it is your preference or necessary for a medical condition. But please note that extended (all night) and repeated use may discolor the exterior ticking over time, which would not be covered under the terms of our 25-year limited warranty.
Of course, it would be our general preference to use quality natural and organic bedding, rather than an electric mattress pad, if your goal is simply to stay warm and toasty at night.