A medium-firm mattress is supportive underneath with a comfortable layer on top. It's the feel we suggest most often for growing children and teenagers, and it suits back sleepers and anyone who wants support without a hard feel.
Our medium-firm mattresses
For bunk beds, high sleepers and children's beds:
For floor-level beds:
Why medium-firm for children?
It holds a growing spine in a natural line while still feeling comfortable. Children are light, so a mattress that's too soft gives them little support, and one that's too firm can feel hard. Medium-firm sits between the two.
Medium-firm or firm?
Firm has very little give; medium-firm has a comfortable top over firm support. Front sleepers and people who like to lie on top of a mattress may prefer firm. Most other sleepers find medium-firm the better balance.
How we rate firmness
We rate every mattress from 1 (softest) to 10 (firmest):
- Medium-soft: about 4.
- Medium: 5 to 6.
- Medium-firm: 7.
- Firm: 8 to 9.
Medium-firm mattresses: common questions
Is medium-firm good for back pain?
Many people with back pain prefer medium-firm support. Comfort is personal, so speak to a health professional if pain persists.
Is medium-firm good for side sleepers?
It suits many side sleepers, especially with a memory foam top like the MemoryDream 15. If you find it too firm at the shoulder, try a medium mattress.
Which medium-firm mattress is best for a bunk bed?
The MemoryDream 15 or PocketRest 15, both 15cm deep. Check the bed's maximum mattress depth first.
Not sure which to choose? Message our family team with your bed's size and the maximum mattress depth on its product page, and we'll point you to the right mattress.
Written by the Millie & Jones family team. Last updated October 2026.
