I have a new organic latex mattress with a wool top. It is soft and supporting, but I am craving a bed I can sink into, and be enveloped by. I am looking at either a wool or a down mattress topper. As far as weight goes I am a 125 pound woman who has never had a back problem and who loves soft, so don't worry about the "no support" aspect. I live in San Diego so the temperature varies from 50-85 degrees. All this info is given in case any of this matters in your advice.