A mattress is one of the few purchases in a home that directly affects your health every single night, yet it's often chosen quickly, based on a brief test lie-down in a showroom or a sale price that seemed too good to pass up. Given that most people spend around a third of their life asleep, and a mattress typically needs to last close to a decade, it's worth approaching this decision with far more care than the average furniture purchase.
Choosing the right mattress comes down to understanding firmness, material, and how your own body and sleeping position interact with both. This guide walks through exactly what to consider, so you can choose a mattress that genuinely supports good sleep for years to come, rather than one that looked appealing in a shop for the ten minutes you spent testing it.
Step 1: Understand Firmness and How It Relates to Sleeping Position
Firmness is often the first thing people ask about when shopping for a mattress, yet the right level of firmness depends heavily on individual sleeping position and body weight, rather than being a universal preference.
Side sleepers generally benefit from a medium to medium-soft mattress, since this allows the mattress to cushion the shoulders and hips, which bear the most pressure in this position, while still providing enough support to keep the spine aligned.
Back sleepers typically suit a medium to medium-firm mattress, offering enough support to maintain the natural curve of the lower back without allowing the hips to sink too deeply, which can lead to discomfort over a full night's sleep.
Stomach sleepers generally require a firmer mattress, since a softer surface can allow the midsection to sink too far, placing strain on the lower back over time. A firmer surface helps keep the spine in a more neutral position throughout the night.
Body weight also plays a role here. Heavier individuals often need a firmer mattress than the general guidance above suggests, since additional body weight causes deeper sinkage into a softer mattress than a lighter person would experience on the same surface. Conversely, lighter individuals may find a very firm mattress feels overly hard, without the give needed to properly cushion pressure points.
Step 2: Compare Mattress Material Types
Beyond firmness, the underlying material and construction of a mattress significantly affects how it feels, how well it regulates temperature, and how long it's likely to last.
Memory foam mattresses contour closely to the body, offering excellent pressure relief, particularly for side sleepers and anyone with joint discomfort. The trade-off is that traditional memory foam can retain heat, though many modern versions include cooling gel infusions or more breathable open-cell foam structures specifically designed to address this issue.
Innerspring mattresses use a network of coiled springs for support, typically topped with a layer of foam or fibre padding for comfort. They tend to offer a bouncier, more responsive feel compared to memory foam, and generally sleep cooler, since the coil structure allows for greater airflow throughout the mattress.
Hybrid mattresses combine an innerspring support base with a foam or latex comfort layer on top, aiming to offer the pressure relief benefits of foam alongside the airflow and responsiveness of a traditional spring mattress. This has become an increasingly popular category, since it aims to solve the temperature retention issue of pure foam mattresses while still offering more contouring support than a traditional innerspring alone.
Latex mattresses offer a naturally responsive, slightly bouncier feel than memory foam, along with good breathability and a longer expected lifespan than most other material types. They tend to sit at a higher price point, though many buyers find the combination of durability and natural material appeal worth the additional investment.
Step 3: Choose the Right Size for Your Bed Frame and Room
Mattress size needs to align with both your bed frame and the room itself, and it's worth confirming this measurement before falling in love with a specific mattress model. Standard Australian sizes range from king single through to super king, and choosing the right size depends on both the number of people sleeping in the bed and the room's available floor space.
For couples, a queen size mattress remains the most popular choice, offering a reasonable balance of space and room footprint for most standard sized main bedrooms. Couples who prioritise additional individual space, or who share the bed with children or pets regularly, may find a king size mattress worth the additional room requirement, provided the bedroom itself is large enough to accommodate it comfortably. Our earlier guide on How to Choose a Bed Frame covers the specific room dimensions needed for each mattress size in more detail.
Step 4: Consider Motion Isolation for Shared Beds
For couples sharing a bed, particularly where one partner moves more during the night or has a significantly different sleep schedule, motion isolation is a genuinely important factor to consider. Memory foam and hybrid mattresses with individually wrapped coils generally offer the best motion isolation, absorbing movement from one side of the bed without transferring it noticeably to the other. Traditional innerspring mattresses, by contrast, tend to transfer motion more readily across the full surface, which can be disruptive for a partner who's easily woken by movement.
Step 5: Factor In Temperature Regulation
Australia's warmer climate makes temperature regulation a genuinely important consideration for many buyers, particularly in northern states or homes without reliable air conditioning throughout summer. Innerspring and hybrid mattresses generally sleep cooler than traditional memory foam, thanks to greater airflow through the coil structure. If you're specifically drawn to the pressure relief of memory foam but are concerned about heat retention, look for models featuring cooling gel infusions, copper infused foam, or an open-cell foam structure, all of which are designed to address this issue directly.
Step 6: Understand Trial Periods and Return Policies
Given how significant a purchase a mattress represents, and how difficult it genuinely is to judge long-term comfort from a brief showroom test, it's worth prioritising retailers offering a genuine trial period, typically 100 nights or more, during which the mattress can be returned or exchanged if it doesn't suit your sleep. A body needs time to properly adjust to a new mattress, and comfort that feels slightly unfamiliar in the first week can often settle into genuine support after several weeks of regular use, which is exactly why longer trial periods have become such a standard and valuable feature in the mattress industry.
Step 7: Know When It's Time to Replace a Mattress
Most mattresses have a genuine functional lifespan of around seven to ten years, though this varies depending on material quality and how well the mattress has been cared for. Signs that a mattress needs replacing include visible sagging, waking with new or worsening aches and pains, noticeably reduced comfort compared to when it was new, or a level of wear that's become obvious simply from looking at the mattress itself.
If you're regularly waking with discomfort but your mattress is relatively new, it's worth reconsidering firmness level or material type rather than assuming the mattress itself is simply faulty, since firmness mismatch is one of the most common reasons a newer mattress fails to deliver the comfort expected.
Common Mattress Buying Mistakes to Avoid
- Choosing firmness based on general preference rather than actual sleeping position and body weight
- Prioritising price over trial period and return policy, given how difficult it is to judge comfort from a brief showroom test
- Assuming memory foam is always the best option without considering temperature regulation needs
- Ignoring motion isolation when purchasing for a shared bed with a partner who has a different sleep schedule
- Keeping a mattress well beyond its functional lifespan simply because it hasn't visibly fallen apart
Final Thoughts
Choosing a mattress comes down to understanding your own sleeping position, body weight and temperature preferences, then matching these to the right firmness level and material type. Given how significant an investment a quality mattress represents, and how directly it affects nightly sleep quality, it's worth taking the time to genuinely test options and prioritise a solid trial period, rather than rushing the decision based on price or a brief showroom visit alone.
Explore the full Mattress range to find the right firmness, material and size for your sleep needs.
