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Quick Answer: Most Australian mattress protectors are sold by bed size (single, double, queen, king, etc.) and by mattress depth (commonly 24cm or 33cm+ for fitted styles). If your mattress is a standard depth (up to around 27cm), a 24cm-rated protector will fit. If you have a pillow-top, plush, or deeper mattress, size up to a 33cm+ depth option — most fitted protectors and encasements also stretch 4–5cm in any direction, giving a bit of margin either way.
Buying a mattress protector should be simple, but it’s one of the most common sources of “wrong size” returns and frustrated reviews — usually because the buyer matched the bed size correctly but got the depth wrong, or didn’t realise a protector and an encasement are sized and fitted differently.
This guide walks through exactly how mattress protector sizing works in Australia, how to measure your own mattress in under a minute, and which product type suits which mattress — so you order the right one the first time.
Cover & Protect has supplied mattress and bedding protection to Australian households, hotels, and healthcare providers since 2007, as an authorised direct-to-consumer distributor of genuine Protect-A-Bed® products across multiple depth and size ranges. This guide is based on that product range and the sizing questions we’re asked most often.
Mattress protectors and encasements are sized on two separate measurements, and it’s easy to get one right and the other wrong:
Most fitted mattress protectors and encasements are designed with a bit of stretch built into the fabric — commonly around 4 to 5cm in any direction — which is why two depth options (for example, 24cm and 33cm) can comfortably cover the full range of mattresses sold in Australia rather than needing a separate size for every possible thickness.
If your mattress sits right on the boundary between two depth options (for example, 24–27cm), sizing up to the deeper option is usually the safer choice, since a slightly loose fit is less of a problem than one that won’t stretch over the corners at all.
| Bed Size | Approx. Mattress Dimensions (W x L) | Standard Depth Option | Deep/Extra-Deep Option | Best For |
|---|---|---|---|---|
| Single | 92 x 188 cm | ~24cm | ~33cm+ | Kids’ beds, single guest rooms |
| King Single | 107 x 203 cm | ~24cm | ~33cm+ | Teen/adult single rooms |
| Double | 138 x 188 cm | ~24cm | ~33cm+ | Shared standard beds, guest rooms |
| Queen | 153 x 203 cm | ~24cm | ~33cm+ | Most common adult bed size |
| King | 183 x 203 cm | ~24cm | ~33cm+ | Larger primary bedrooms |
| Super King | 203 x 203 cm | ~24cm | ~33cm+ | Premium/custom bed setups |
Depth options and exact stretch tolerance vary slightly by specific product range — always check the individual product page for confirmed depth fit before ordering, particularly for pillow-top or plush mattresses over 40cm.
Standard 24cm depth suits you if:
Deep 33cm+ (or extra-deep 40–50cm) suits you if:
A fully zippered encasement (rather than a fitted protector) suits you if:
How do I measure my mattress for the right protector depth? Use a tape measure to check the height from the bottom edge of the mattress to the top of the sleep surface, at the side of the bed. Round up to the nearest depth option rather than down, since a slightly looser fit is preferable to one that won’t stretch over the corners.
What’s the difference between a 24cm and a 33cm mattress protector? The number refers to the maximum mattress depth (height) the protector is designed to stretch over and stay securely fitted to. A 24cm protector suits standard mattresses; a 33cm or deeper option is needed for pillow-top, Euro-top, or plush mattresses that sit higher.
Will a mattress protector stretch to fit if my mattress is slightly deeper than the stated size? Most quality protectors and encasements include some stretch — commonly 4 to 5cm in any direction — but this isn’t a substitute for choosing the correct depth range. If your mattress is close to the upper limit of a depth option, size up rather than relying on stretch alone.
Is a queen mattress protector the same size across all brands? Bed size names (queen, king, etc.) are broadly standardised in Australia, but exact centimetre dimensions can vary slightly by manufacturer. If you’re unsure, measure your mattress directly rather than relying on the size label alone.
Do I need a different protector for a mattress topper? If you use a mattress topper under your fitted sheet, measure the combined depth of mattress plus topper when choosing a protector or encasement depth, since the topper effectively increases the total height the protector needs to stretch over.
What if my mattress is between two depth options? Choose the deeper option. A protector with some room to spare will sit securely; one that’s too shallow may not stay fitted at the corners overnight.
Based on the most common sizing questions we’re asked, our recommendation is:
Cover & Protect has been an authorised direct-to-consumer distributor of genuine Protect-A-Bed® bedding protection products in Australia since 2007, supplying households, hotels, and healthcare providers with correctly fitted mattress protection across a full range of bed sizes and mattress depths. Sizing questions are among the most common queries we receive, which is exactly why we’ve put together this guide — to help you land on the right product on the first order, rather than guessing and hoping it fits.
Getting the right mattress protector comes down to two numbers: your bed size and your mattress depth. Measure both before you buy, round up if you’re between depth options, and choose a fitted waterproof mattress protector for everyday protection or a fully zippered mattress encasement if complete sealing against allergens, bed bugs, or heavier incontinence is the goal. Still not sure which depth or style fits your mattress? Check the specific sizing details on each product page before ordering, or get in touch before you buy.
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Our range of mattress, pillow and bedding protectors is designed to help safeguard your bedding from bed bugs, dust mites, allergens, spills and everyday stains—while supporting a cleaner, healthier and more hygienic sleep environment.
A mattress protector is an essential accessory for preserving the longevity and cleanliness of your mattress. Whether you have just invested in a new mattress or want to extend the life of an existing one, a mattress protector can provide the necessary barrier against dirt, allergens, and spills. However, not all mattress protectors are the same—one of the biggest distinctions comes down to whether they are waterproof or non-waterproof.
In this article, we will explore the key differences between waterproof and non-waterproof mattress protectors, their benefits and drawbacks, and how to choose the right one for your needs.
A mattress protector is a removable cover designed to safeguard a mattress against various external elements such as dust, dirt, allergens, moisture, and even bed bugs. These protectors act as a shield, keeping the mattress clean and extending its lifespan.
There are two main types of mattress protectors:
1. Protection Against Spills and Stains.
o Ideal for households with children, pets, or individuals who may experience bedwetting or incontinence.
o Helps prevent permanent staining and potential mold or mildew growth.
• Waterproof Mattress Protectors: Designed to prevent liquid spills, stains, and moisture from reaching the mattress.
• Non-Waterproof Mattress Protectors: Offer protection from dust, allergens, and wear and tear but do not provide a barrier against liquids.
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What Are Waterproof Mattress Protectors?
Waterproof mattress protectors feature a liquid-resistant barrier, usually made from materials such as polyurethane or vinyl, which prevents moisture from penetrating the mattress. These protectors are particularly useful for individuals who want to safeguard their beds against spills, incontinence, bedwetting, and accidental liquid exposure.
Benefits of Waterproof Mattress Protectors
1. Protection Against Spills and Stains
o Ideal for households with children, pets, or individuals who may experience bedwetting or incontinence.
o Helps prevent permanent staining and potential mold or mildew growth.
2. Allergy and Dust Mite Protection
o Acts as a barrier against allergens, dust mites, and bacteria, reducing allergic reactions.
o Some waterproof protectors also come with hypoallergenic properties.
3. Prevention of Mould and Mildew
o Because liquids cannot seep into the mattress, the risk of mold and mildew buildup is significantly reduced.
4. Extended Mattress Lifespan
o Protects the mattress from premature deterioration due to moisture damage.
5. Easy Maintenance
o Most waterproof protectors are machine washable, making them easy to clean and maintain.
Drawbacks of Waterproof Mattress Protectors
1. Potential Heat Retention
o Some waterproof protectors may trap heat, making them uncomfortable for hot sleepers.
o However, newer models use breathable waterproof materials to reduce heat buildup.
2. Noise and Texture
o Some waterproof protectors, particularly those made from vinyl, can produce a crinkling noise when moved.
o Higher-quality waterproof protectors use soft fabrics like cotton with a quiet waterproof backing to eliminate this issue.
3. Cost
o Waterproof protectors tend to be more expensive than non-waterproof options due to their additional protective layer.
What Are Non-Waterproof Mattress Protectors?
Non-waterproof mattress protectors focus on providing a breathable, comfortable barrier between the sleeper and the mattress. These protectors are usually made from cotton, bamboo, or polyester blends and do not include a waterproof lining.
Benefits of Non-Waterproof Mattress Protectors
1. Enhanced Breathability
o Since there is no waterproof barrier, these protectors offer better airflow, helping regulate body temperature and reducing heat buildup.
2. Soft and Comfortable Feel
o Many non-waterproof protectors feel more like a regular bedsheet and add extra comfort without altering the mattress’s natural texture.
3. No Noise Issues
o Without a waterproof layer, these protectors do not produce any crinkling or rustling sounds when moving in bed.
4. Hypoallergenic Options Available
o Many non-waterproof protectors are designed to be hypoallergenic, offering protection against dust mites, pet dander, and other allergens.
5. Affordability o Generally, non-waterproof protectors are more budget-friendly compared to their waterproof counterparts.
Drawbacks of Non-Waterproof Mattress Protectors
1. Lack of Liquid Protection
o Since these protectors do not block liquid spills, any accidental drink spillage, sweat, or incontinence incidents may seep into the mattress.
2. Limited Protection Against Stains and Odours
o While they help prevent dust accumulation, they cannot prevent liquid stains or odours from developing over time.
3. Shorter Lifespan
o Without moisture resistance, these protectors may wear out faster due to repeated washing and exposure to spills.
Choosing the Right Mattress Protector for You
When deciding between a waterproof and non-waterproof mattress protector, consider the following factors:
Who Should Choose a Waterproof Mattress Protector?
• Parents with young children who may have bedwetting accidents.
• Individuals with incontinence issues or medical conditions requiring bed protection.
• Households with pets that might cause accidental spills.
• People who frequently eat or drink in bed.
• Those who live in humid climates where moisture build-up can lead to mould.
Both waterproof and non-waterproof mattress protectors serve essential roles in keeping your mattress clean and prolonging its lifespan. The best choice depends on your specific needs, lifestyle, and comfort preferences. If liquid protection is a priority, a waterproof mattress protector is the way to go. However, if breathability and comfort are more important, a non-waterproof protector might be the better option.
Regardless of your choice, investing in a mattress protector is always a wise decision to keep your sleeping environment hygienic and comfortable.
