What is Firmness?
Firmness (soft / medium / firm)
How much you sink in, usually scored 1–10.
Short answer
Heavier bodies experience the same mattress as softer — size firmness up with weight.
Firmness when buying a mattress
How much you sink in, usually scored 1–10.
Why it matters: Side sleepers need give at shoulder and hip; back and stomach sleepers need support to keep the spine level.
Look for: Heavier bodies experience the same mattress as softer — size firmness up with weight.
Full Mattress buying guide