You can consider numerous factors to help you narrow down which firmness level would be best for you.
These include, but are not limited to:
- Your weight, height, and build.
- Your preferred sleeping position.
- Personal preference.
Firmness and body size
As a general rule of thumb, you need a firmer mattress if you’re heavier-weight, very tall, or have a bigger build.
In contrast, if you’re lighter or of a more petite build, you may be comfortable on a softer mattress - and firmer mattresses may seem “too hard” for you.
Firmness and sleeping position
Your sleeping position is an essential factor to consider as you need more support or more leeway and softness in some regions of your body, depending on your sleeping position.
When you sleep on your side, only some areas of your body make contact with the mattress.
This means that all of your body weight is concentrated at these parts, placing excessive pressure on specific points of a mattress.
A softer mattress is the preferred choice for side sleepers as it enables heavier body parts like your pelvic area and shoulders to sink into the foam more deeply than lighter parts, which allows for a neutral spine alignment.
Stomach sleepers usually do better on firmer beds.
If the mattress is too soft, the lower back bends slightly, and the spine can easily fall out of alignment.
A firm bed keeps stomach sleepers level.
Back sleepers need a happy medium and, generally, sleep best on medium-firm mattresses.
This is because the mattress needs to be soft enough to be comfortable but firm enough to lift the hips into alignment with their shoulders, keeping a neutral back.