No, thicker does not automatically mean more comfortable.
A thicker mattress can be helpful for some sleepers, especially if it includes a quality support core and a better pressure-relief layer. But if the materials are weak, the surface is too soft, or the mattress does not suit your sleep position, extra thickness can leave you feeling less supported, not more comfortable.
What you will learn on this page
Myth vs reality
Myth: More height always means more comfort
Comfort is not created by height alone. A tall mattress with cheap foams or poor support can feel impressive in a showroom but disappoint over time.
Reality: Internal build matters more
The quality of the comfort layer, transition layer, and support core determines how well a mattress relieves pressure, resists sagging, and keeps your body aligned.
Best fit beats blanket advice
A side sleeper, a stomach sleeper, and a heavier couple can all need very different mattress builds. "Thicker is better" is too simplistic to be useful.
Your sleep position changes what feels comfortable
The same mattress can feel supportive to one sleeper and awkward to another. That is why thickness should be judged alongside your sleep style and the way the comfort layers respond to your body.
What actually affects mattress comfort?
1. Support core strength
The support core does the heavy lifting. If it is weak, a thicker profile will not save the mattress from sagging or poor alignment.
2. Pressure relief
Shoulders, hips and joints need the right amount of give. Too little feels harsh. Too much can leave you stuck and unsupported.
3. Firmness match
A mattress can be thick and still feel wrong if the firmness does not suit the way you sleep.
4. Material quality
Memory foam, latex, pocket spring and hybrid builds all perform differently. Quality matters more than headline thickness.
5. Motion isolation
If you share a bed, the way the mattress handles movement can affect sleep more than an extra few centimetres ever will.
6. Edge support
Edge support matters for sitting, getting in and out of bed, and using the full sleep surface comfortably.
7. Bed height
The mattress plus the base should feel easy to get into and out of. An overly tall setup can be awkward in everyday use.
Thickness is one piece of the comfort puzzle
When you browse our mattress collection, use thickness as a filter after you have narrowed the field by feel, size, firmness, and construction. That is a much smarter way to shop than starting with the tallest mattress you can find.
Mattress thickness guide: what each range is usually best for
These ranges are a practical buying guide, not rigid rules. A well-built mattress can outperform a thicker one if its materials and support are better suited to you.
| Thickness | Typical best use | Who it may suit | Watch-outs |
|---|---|---|---|
| Under 20 cm | Low-profile setups, bunk beds, some guest rooms, lighter use | Kids, occasional sleepers, compact spaces | May not offer enough depth for pressure relief or heavier adult use |
| 20 to 25 cm | Simple everyday support in slimmer builds | Lighter sleepers, firmer-feel shoppers, spare rooms | Can feel too shallow if the comfort system is basic |
| 25 to 30 cm | Balanced everyday comfort for many adults | Back sleepers, combination sleepers, many couples | Still needs a quality support core and the right firmness |
| 30 to 35 cm | Extra room for deeper comfort layers and stronger support systems | Some side sleepers, heavier sleepers, couples needing pressure relief | Can feel too soft or too tall if the build is not balanced |
| 35 cm+ | Luxury-profile mattresses and specialised comfort builds | Shoppers who want a taller feel and premium finish | Not automatically better; total bed height and support must still work for you |
A mattress in the 25 to 30 cm range with quality foams, supportive coils or latex, and a firmness that matches your body.
A mattress advertised as 35 cm+ without clear details on support core, edge support, motion isolation, or durability.
How to choose thickness by sleep style and body type
Side sleepers
Often prefer better cushioning at the shoulders and hips. A mattress with a deeper comfort system can help, but only if it still keeps the spine supported.
Back sleepers
Usually do well with balanced support and a moderate comfort layer. Too much sink can throw the hips out of line.
Stomach sleepers
Often need a more supportive feel with less sink through the middle of the body. Thickness is less important than stability here.
Under 60 kg
Lighter bodies usually do not need an ultra-tall mattress to feel supported. Focus on surface feel and pressure relief.
60 to 100 kg
Many sleepers in this range are well served by a well-built everyday profile, especially in the 25 to 30 cm zone.
100 kg+
Deeper support layers and more robust construction can become more important. Here, extra thickness may help if the internal build is strong enough.
When a thicker mattress helps — and when it is mostly marketing
- ✓You need extra pressure relief as a side sleeper.
- ✓You share a bed and want stronger motion isolation.
- ✓You are a heavier sleeper and need deeper support layers.
- ✓You want a higher sleep surface because your bed base sits low.
- ✓The materials are low grade or the support core is weak.
- ✓The bed becomes too high for easy everyday use.
- ✓You prefer a firmer, flatter feel with less sink.
- ✓A topper or pillow-top is being used to hide poor support underneath.
How to test a mattress the smart way in-store
If you can test in person, use that advantage. A quick hand-press is not enough. Lie in your normal sleep position long enough to notice whether your hips sink too far, whether your shoulders feel pressure, and whether the edge feels stable when you sit.
Use this quick in-store checklist
- ✓Lie in your usual sleep position, not just on your back.
- ✓Check whether your shoulders, hips, and lower back feel supported.
- ✓Notice whether you feel "stuck" or whether turning is easy.
- ✓Sit on the edge to judge how stable the mattress feels.
- ✓Think about total bed height, especially if you use a taller bed base.
QLD buying tips: choose for real life, not just the showroom look
What to prioritise first
Start with size, feel and construction. On our mattress category pages you can shop by Single, King Single, Double, Queen, King and Super King, browse soft, medium, firm and extra firm comfort levels, and explore different types including memory foam, latex and pocket spring mattresses.
That means you can shortlist the right mattress style before thickness becomes the tie-breaker.
Built for local shoppers, not generic global advice
This article is written for Queensland mattress shoppers by The A2Z Furniture team. We are a family-run Queensland business established in 2013, with five SE QLD showrooms where you can compare mattress feels in person before you buy.
This page is general buying guidance only. If you have ongoing pain, sleep disruption, or a health condition, talk to a qualified health professional.
Independent resources worth reading
Good EEAT is not just about saying "trust us". It is about helping readers verify what they are learning. Here are a few credible resources to support smarter mattress buying and sleep decisions:
- CHOICE mattress buying guide — practical Australian guidance on sleep position, mattress type, in-store testing and value.
- The Lancet study on mattress firmness and chronic low-back pain — often cited when discussing why "harder" or "thicker" is not automatically better.
- Healthdirect back pain overview — useful if discomfort is becoming a broader health issue rather than just a mattress shopping issue.
- Sleep Health Foundation resources — evidence-based Australian information on sleep health and better sleep habits.
Ready to choose a mattress that fits your body, not just the trend?
Browse our mattress range online or visit one of our five SE QLD showrooms to compare comfort levels in person. We can help you narrow the options by size, firmness, mattress type, and how you actually sleep.