Queen size medium firm memory foam mattresses are perfect if you’re looking for something not too firm, but also not too plush. It’s usually the preferred option for a back sleeper mattress type due to its balanced flexibility. Featuring multiple foam layers with open cell technology, lbessy queen size medium firm memory foam mattress all-foam mattress is designed for an elevated sleep experience. Variable depths in the high-density base foam ensure durability and stability for the life of your bed while also allowing you to customize your firmness level. Open-cell technology in each foam layer provides increased airflow and breathability.