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Sleep Firm Ultra Mattress 'Best Firm Feel Mattress' 🏆
$1,520.00
The Sleep Firm Ultra Mattress is built for maximum support with a 5-Zone Pocket Spring System, ultra firm springs, and a double layer of ultra firm foam. With a firmness rating of 9.5/10, it’s the ultimate choice for sleepers who want no compromise on firmness, stability, and spine alignment. Proudly Australian made for lasting strength and support.
15 Year Warranty
Our goal is for every customer to be totally satisfied with their purchase. If this isn't the case, let us know and we'll do our best to work with you to make it right.
FREE Shipping*
We will work quickly to ship your order as soon as possible. Once your order has shipped, you will receive an email with further information. Delivery times vary depending on your location.
Awarded Australia's Best Firm Mattress
Our products are manufactured both locally and globally. We carefully select our manufacturing partners to ensure our products are high quality and a fair value.
Product Dimensions
150-night sleep trial
If you don’t love the firmness of our mattress in the first 150 nights of sleeping, then you can return it for a full refund.
Award winning mattress
Awarded as Bedbuyer’s 'Best Firm Mattress. Awarded for 2026'
Nearly Perfect!
With an average rating of 4.9 stars on productreview.com.au, our happy customers are making themselves heard.
Australia's best firm mattress
Awarded as Bedbuyer’s ‘Best Firm Mattress 2026'
4.9 stars
With an average rating of 4.9 stars on ProductReview.com.au, our happy customers are making themselves heard.
Endorsed by the Australian Spinal Research Foundation
The Sleep Firm mattress has been officially endorsed by the Australian Spinal Research Foundation.
GECA and Sensitive Choice certified
Achieved GECA and Sensitive Choice certifications, highlighting environmental responsibility and asthma-friendliness.
Choice reviewed
Reviewed and compared by Choice. Read the review.
Rated a true 9.5/10 on the firmness scale – the Sleep Firm Ultra delivers uncompromising support night after night.
The double layer of ultra firm foam reinforces the feel to create an incredibly supportive sleep surface.
With a firmness rating of 9.5/10, this mattress is one of the firmest on the market, designed specifically for back and stomach sleepers, as well as anyone seeking a solid, no-sink sleeping experience. Edge-to-edge support ensures every part of the mattress feels equally firm, so you can sleep comfortably across the full surface.
Australia’s firmest mattress in a box, built for true support and lasting comfort.
At Sleep Firm, we have a single-minded focus – giving the people firmness. We make entirely firm mattresses, from the centre to the firm supportive edge.
Other mattress brands might have a soft mattress and a slightly firmer pocket spring mattress in their range. Not us. We are firm to the core.
42% stronger than standard springs.
At the heart of the Sleep Firm mattress is the S+ Pro 5-Zone Pocket Spring System, engineered for superior support and durability. Each individually encased spring responds independently to body weight and movement, ensuring targeted pressure relief and minimising partner disturbance. With up to 1,326 springs in a King size, the system provides precise spinal alignment and edge-to-edge stability, so sleepers enjoy consistent firmness across the entire surface. Constructed with medical-grade fabric and tested to be up to 42% stronger than standard pocket springs, these springs are built to deliver uncompromising support and long-lasting performance.
S+ Pro 5‑Zone Pocket Spring System
Our 5 Zone S+Pro high spring count mattresses promote the best support for all body types and weights. You won’t find this in a major retail store mattress.
Double Layer of Boomerang foam
Our Boomerang Foam technology is a premium density foam that springs back into place, night after night. Its open cell structure will also keep your sleep environment cool. Its so good, we doubled it!
5 sleeping zones
Each zone is designed to provide targeted support to different parts of the body, with the goal of promoting proper spinal alignment and reducing pressure points.
Foam box edge
Our quality foam box edge helps prevent roll off. You can rest assured that your firm mattress will continue to provide a high level of sleep quality from edge to edge.
Why Sleep Firm
Sleep Firm was founded with a single-minded goal – to create the best mattress for people who like a firm feel. Through years of research, design, and feedback, we’ve created a sleeping solution that meets the very specific needs of our customers.
Firmness is all we know. You won’t find a better extra firm mattress anywhere in Australia. We are so confident that you’ll love our firm mattress, that we’ll give you 150 nights to try it, totally risk-free.
Ultra Firm Mattress.
The Sleep Firm Ultra is designed to be as firm as a mattress can get, with a true 9.5/10 firmness rating. Built for sleepers who want no give and no sink, it provides an ultra-supportive surface that keeps the spine perfectly aligned throughout the night. The combination of extra-firm springs and a double layer of ultra-firm foam creates a sleeping experience that feels solid, stable, and reassuringly supportive from edge to edge. Ideal for back and stomach sleepers or anyone who craves the feel of absolute firmness, this mattress redefines what it means to sleep on a truly firm bed.
Side-by-Side
Side-by-Side Comparison
Every spec, head to head.
| Feature | Sleep Firm | Sleep Firm Ultra | Sleep Firm Luxe |
|---|---|---|---|
| Starting Price | $1,120 | $1,520 | $1,920 |
| Firmness Rating | 9/10 — Firm | 9.5/10 — Ultra | 7/10 — Balanced |
| Height | 26 cm | 28 cm | 30 cm |
| Spring System | S+ Pro 5-Zone | S+ Pro 5-Zone Ultra | S+ Pro 5-Zone |
| Springs (King) | Up to 1,326 | Up to 1,326 | Up to 1,326 |
| Comfort Foam | Boomerang Foam | Double Ultra Firm Foam | CloudGel™ Italian Gel Foam |
| Temperature Regulation | Open-cell foam | Open-cell foam | Advanced gel cooling |
| Best For | All sleepers | Back & stomach sleepers | Side & hot sleepers |
| Melbourne Metro Delivery | 3 business days | 3 business days | 3 business days |
| Trial | 150 nights | 150 nights | 150 nights |
| Warranty | 15 years | 15 years | 15 years |
| GECA Certified | ✓ | ✓ | ✓ |
| Sensitive Choice | ✓ | ✓ | ✓ |
| Spinal Foundation Endorsed | ✓ | ✓ | ✓ |
| Award | – | Bedbuyer Best Firm 2026 | – |
Up to 1326 Springs
High spring count tailored for spinal alignment, with medical‑grade fabric.
The Queen model features 900 springs; King has 1,326.
42% stronger
Our specialised spring technolgoy ensures 42% greater strength than typical pocket springs.
Zoned for trailed firmness
Each zone is designed to provide targeted support to different parts of the body, with the goal of promoting proper spinal alignment and reducing pressure points.
150-night sleep trial
We're so confident that you'll love it that we offer a 150-night sleep trial.
Enjoy sleeping firmer for 150 nights, totally risk-free
If you don’t love the firmness of our mattress in the first 150
nights of sleeping, then you can return it for a full refund.
Discover the Premium Australian Craftsmanship of Sleep Firm Mattresses.
The Sleep Firm mattress is proudly Australian made, crafted in Melbourne by Chiropedic—a family-owned business with over 30 years of local manufacturing expertise. Every mattress is designed, cut, stitched, and assembled right here in Australia, using premium materials sourced to meet strict quality and safety standards. By choosing Sleep Firm, you’re not only getting a mattress built for true firmness and lasting support, but also supporting Australian jobs, local craftsmanship, and a product that’s made specifically for Australian sleepers and conditions.
Don't just take our word for it!
Our customers are firm beleivers in better sleep.
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Frequently asked questions
What is our 150-night trial?
We give you 150 nights to test out our firm mattress totally risk-free. This means that if you are unsatisfied with your mattress, you can return it for a full refund. All returned mattresses are donated to our charity partner the Salvos to help those in need or sent to a mattress recycler.
We always recommend trying the mattress for at least 14 nights before sending it back to us. Some mattresses take some getting used to, especially super firm ones like ours!
Please note the trial is limited to one return per household, delivery address or order. If you need to purchase multiple mattresses, we recommend buying one first to make sure you are happy then placing another order.
How do I organise a return?
If you would like to return your mattress, please complete the contact form by clicking here.
Once your return request is sent to us, we will then arrange for it to be collected by Salvos free of charge, and once the collection is completed, we will give you a full refund.
Return is free in all Metro location (Melbourne, Sydney, Canberra, Brisbane, Gold Coast, Adelaide, Hobart & Perth). If you live in a regional, rural or an area outside of Salvos network we will ask you for assistance in donating/dropping off the mattress directly to your closest charity or mattress recycler and email us proof of donation/drop off and we will give you a full refund.
As our returned mattresses are sent to charities to live a new life, they must be in as-new condition with no damage, stains, marks or rips. We highly recommend using a mattress protector to ensure this, should you wish to return it.
How much is delivery?
Delivery is free to eligible metro and inner regional areas, provided your location is serviced by our delivery partners.
How does delivery work?
Once your order is complete, your product will be dispatched from our Melbourne warehouse, and will be delivered to you based on the average* delivery times below:
- Melbourne Metro within 3 business days
- Sydney, Brisbane, Adelaide & Canberra Metro within 14 business days
- All other areas within 21 business days.
Business days are defined as Monday to Friday and exclude weekends and public holidays. From time to time, the lead time may be longer depending on the location.
ADDITIONAL DELIVERY OPTION – MELBOURNE METRO ONLY
Premium Delivery – $129: If you wish to have your goods taken inside and set up in the room for you, you will need to select the Premium Delivery Service. Please note that the room must be empty and ready for setup, as our service does not include removing or disposing of the old mattress and base.
IMPORTANT
- The delivery service is to the Front Door of a Ground Floor dwelling ONLY. Depending on your location/delivery address you may be asked to help the driver to unload the mattress from the back of the truck/ute/van.
- Our delivery partners do not take items indoors or upstairs.
How do I unpack my mattress?
The Sleep Firm mattress comes with opening instructions. You simply open the blue outer wrapper with scissors without puncturing the inner vacuum bag. The mattress then unfurls on its own. The mattress can take up to 72 hours to return back to the shape it was in the factory.
Where is the mattress made?
The Sleep Firm mattress is manufactured in Melbourne, by Chiropedic who have decades of experience in making and selling over 100,000 mattresses around Australia.
Do I need to rotate the mattress?
We recommend rotating your mattress twice in the first month after purchase and then once per month throughout the warranty period.
For single-sided mattresses, spin 180 degrees (head to toe). For double-sided mattresses (where the sleep surface is identical on the top and bottom), flip over and spin 180 degrees.
