Firmness is subjective. A 200-pound person will find a mattress much softer than a 120-pound person will. Most brands use a scale of 1–10. A is the "universal" medium-firm that works for the majority of people, but don't be afraid to go higher or lower based on your weight and preference. 4. Don't Skip the Trial Period
A medium-firm feel is ideal. It provides enough "push back" to support the lower back while offering enough contouring for the spine's natural curve.
You need a softer to medium-firm mattress (often memory foam or hybrid) that allows your shoulders and hips to sink in, keeping your spine straight.
You require a firm surface. Anything too soft will cause your hips to sink, arching your back uncomfortably and leading to morning pain. 2. Choose Your Material
You cannot judge a mattress by sitting on it for five minutes in a showroom. It takes the body about to adjust to a new sleeping surface. Look for brands that offer at least a 100-night sleep trial with a money-back guarantee. If they don't offer a free return policy, keep looking. 5. Check the Warranty
The best of both worlds. These combine a coil base for support with foam or latex layers on top for comfort. 3. The "Firmness" Myth
The traditional choice. They offer excellent airflow (sleeping cool) and a bouncy feel but can lack the pressure relief of modern foams.