Buying a mattress is one of the more significant household purchases you'll make — you'll spend roughly a third of your life on it, and the right choice has a real impact on your sleep quality, energy levels, and physical health. Yet most people spend less time researching a mattress than they do choosing a new phone.
This complete guide walks through every consideration that matters when choosing a mattress in Australia — sleeping position, body type, material type, firmness, cooling, brand considerations, and how to actually use the trial period effectively.
Step 1: Know Your Sleeping Position
Your primary sleeping position is the most important factor in determining the right mattress type and firmness. Most people have a dominant sleeping position, even if they move during the night.
Side Sleepers
The most common position. Side sleepers need a mattress that allows the hip and shoulder to sink in slightly to relieve pressure, while supporting the rest of the body. Medium to medium-soft mattresses suit most side sleepers. Memory foam and quality hybrids work best.
Back Sleepers
Back sleepers need lumbar support — the mattress should fill the natural curve of the lower back without either sagging or pushing the back into an unnatural arch. Medium to medium-firm mattresses suit most back sleepers.
Stomach Sleepers
The most challenging position for spinal health. A firm mattress is generally recommended for stomach sleepers to prevent the hips from sinking below the chest, which would strain the lower back.
Combination Sleepers
If you move between positions during the night, a responsive mattress that makes it easy to shift positions is beneficial. Hybrids and some foams are better for combination sleepers than very dense memory foam that you can 'sink into'.
Step 2: Consider Your Body Weight
- Under 65kg: mattresses feel firmer than rated — consider going softer than the stated firmness suggests
- 65–100kg: standard firmness ratings apply broadly
- Over 100kg: mattresses feel softer than rated — consider going firmer, and prioritise higher-density foam and strong coil systems
Step 3: Choose a Material Type
Memory Foam
Best for: pressure relief, motion isolation, side sleepers, couples. Drawback: can sleep hot. Look for open-cell or gel-infused foam if you're a hot sleeper.
Hybrid (Foam + Pocket Springs)
Best for: cooling, bounce, couples with different preferences, general all-round use. Drawback: more expensive, heavier to move.
Latex
Best for: natural materials, durability, cooling, pressure relief. Drawback: expensive, less widely available in Australia.
Traditional Innerspring
Best for: budget options, traditional feel, cooling. Drawback: motion transfer, pressure points, shorter lifespan at budget price points.
Step 4: Determine Your Firmness
Use the sleeping position and body weight guidelines above as a starting point. If you're unsure, medium (5–6 on a scale of 1–10) is the safest choice for most people. Consider brands with adjustable firmness (Ecosa, Sleeping Duck) if you want flexibility.
Step 5: Think About Temperature
Australian summers are hot. If you sleep warm or live in QLD, WA, or northern NSW, prioritise cooling features: hybrid construction, open-cell foam, gel infusions, and breathable cover materials. Pair any mattress with breathable linen or bamboo sheets.
Step 6: Consider Your Budget
For a primary bedroom mattress, the $900–$1,500 range from a reputable online brand offers the best quality-to-price ratio in Australia. Don't go below $400 for a primary mattress if you can avoid it. Guest rooms can use $400–$800 options.
Step 7: Check Trial Period and Warranty
- Trial period: minimum 100 nights; prefer 120
- Warranty: minimum 10 years; 15 is excellent
- Return policy: free collection is standard for most reputable brands; check the terms
Step 8: Use the Trial Period Properly
Don't judge your new mattress in the first two weeks. Your body needs time to adjust to a new sleep surface, especially if your old mattress was very different. Give it at least 3–4 weeks before forming a firm opinion. Keep the original packaging for returns just in case, and note any physical symptoms like back pain or shoulder discomfort that might indicate a firmness mismatch.
Red Flags to Avoid
- No stated trial period or very short trial (under 30 days)
- Warranty with lots of exclusions — particularly vague 'normal wear and tear' exclusions
- Mattresses without material certifications (CertiPUR-US, OEKO-TEX)
- Brands that won't collect returned mattresses for free within the trial period
Our Recommended Process
Identify your sleeping position and body weight. Use these to narrow down appropriate firmness and material type. Set a budget. Shortlist 2–3 brands that meet your criteria. Check current pricing and promotions. Order from the brand with the longest trial period among your shortlist. Give it a proper 4-week trial before deciding.
Expert Tips for First-Time Mattress Buyers
Beyond the core selection criteria, a few practical considerations can make the difference between a good purchase and a great one.
Test in-store if possible. While online buying dominates in Australia, many brands (Koala, Sleeping Duck, Emma) have showrooms in capital cities. Lying on a mattress for 10 minutes gives you a feel for the surface, even though it won't replicate home conditions. If you can't test in-store, read detailed reviews from verified purchasers focusing on your sleeping position and weight range.
Account for your partner's preferences. If you share a bed, you're compromising. Hybrids and pocket-spring mattresses excel at motion isolation—your partner won't feel you tossing and turning. Adjustable firmness options (Ecosa's two-zone system, for example) can be worth the extra cost if you have very different firmness preferences.
Invest in proper support. A good mattress needs a solid base. A worn-out slatted base or poor-quality bed frame will undermine even an excellent mattress. Most Australian beds use slatted bases; ensure slats are spaced no more than 8cm apart.
Don't oversell seasonal needs. Yes, Australian summers are hot, but you also need a mattress that works in winter. A cooling gel-foam hybrid won't feel uncomfortable in June; it simply won't overheat in January. Prioritise cooling if you're in northern Australia year-round, but for temperate regions, a balanced hybrid beats an overly specialised choice.
Frequently Asked Questions
How long should a mattress last?
A quality mattress typically lasts 8–10 years. Budget options may sag or lose support after 5–7 years. Premium foam and hybrid mattresses from established brands (Koala, Emma, Sleeping Duck) often perform well for 10+ years if properly cared for. Rotate your mattress every 3–6 months to extend its life.
Should I buy the mattress my friend recommended?
Not necessarily. Personal recommendation is useful for brand reputation and trial experience, but mattress preference is individual. What works for someone 25kg heavier or a back sleeper may feel wrong for you. Use recommendations as a starting point, not a directive. Check the trial period and test it yourself.
Is a mattress topper a good alternative to replacing a worn mattress?
Toppers can add 2–3 years of life to a sagging mattress, but they're not a long-term fix. A quality 5–7cm topper costs $300–$600 AUD. If your mattress is over 8 years old or actively causing pain, replacement is usually better value than topping it. Toppers work best for minor comfort adjustments on newer mattresses.
Can I return a mattress if I don't like it after 100 nights?
Yes—this is what the trial period is for. Most reputable Australian brands (Koala, Sleeping Duck, Ecosa, Emma, Ergoflex) will collect your mattress free of charge within the trial window. Some charge a restocking or collection fee; check the fine print before ordering. Keep your receipt and packaging as evidence of purchase.
What's the difference between firmness and support?
Firmness is how hard or soft the mattress feels on the surface. Support is how well it maintains spinal alignment and prevents sagging. You can have a soft, well-supported mattress (good memory foam) or a firm mattress with poor support (cheap innerspring). Support matters more for long-term comfort and health.
Do I need to buy a new bed frame?
Not always. Most Australian bed frames accommodate standard mattress sizes (single, double, queen, king). Check your frame dimensions match your mattress before ordering. If your frame is old or wobbly, investing in a new one ($200–$600) improves mattress lifespan and sleep quality significantly.
Mattress Buying Checklist
- Identify your primary sleeping position (side, back, stomach, combination)
- Weigh yourself and confirm your body weight category
- Set a realistic budget ($900–$1,500 for primary bedroom)
- Choose material type based on priority: cooling, pressure relief, bounce, or natural materials
- Determine target firmness range (use sleeping position + body weight guides)
- Shortlist 2–3 brands with trial periods of 100+ nights
- Check warranty length (10+ years) and exclusions
- Verify free collection on returns is included
- Read verified reviews from users matching your profile
- Order during promotional periods if possible (Boxing Day, Black Friday)
- Allow 4 weeks of sleep before deciding to keep or return
Common Mistakes to Avoid
- Choosing based purely on price. A $400 mattress isn't necessarily 50% worse than a $800 option—but it typically is. The relationship between price and durability isn't linear below $1,000 AUD.
- Judging the mattress in the first two weeks. Your body adapts to a new sleep surface. Sore shoulders or back pain in week one often resolves by week three.
- Ignoring your partner's needs. If you're buying for two people with different preferences, a hybrid or adjustable-firmness mattress prevents resentment later.
- Buying the wrong size. Double beds (137cm wide) feel cramped for two adults. Queen (153cm) is the minimum for couples who value personal space.
- Skipping the warranty details. A 15-year warranty with broad exclusions is worse than a 10-year warranty with clear coverage. Read the fine print.
- Not accounting for delivery logistics. Mattresses are bulky. Confirm your doorway and stairwells can accommodate the delivery before ordering.
The Verdict
Choosing the right mattress comes down to matching three variables: your sleeping position, body weight, and personal comfort preference. Follow the step-by-step process outlined here, use the trial period genuinely, and you'll find a mattress that improves your sleep and health for years to come. The best mattress isn't the most expensive or the most popular—it's the one that works for your body, your climate, and your budget.