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Delta Sleep Mattress Review (2022 Update)

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Looking for a new mattress? You may have come across the Delta Sleep Mattress.

Calming Blankets is already well known for its weighted blankets, and their Delta Sleep Mattress is a newcomer to the mattress game.

The question is, does it stack up? In this review, we will take an in-depth look at the pros and cons of the Delta Sleep Mattress, as well as give you our verdict on whether or not it’s worth buying.

Delta Sleep Mattress Review

Mattresses are a matter of personal preference, what may be comfortable for one person might feel uncomfortable for another. So our review is a sum of our technical testing, expert analysis, and the experiences of people who have tried out the mattress. We feel this is a more well-rounded way to assess a mattress, as opposed to just relying on one person’s opinion.

Review Breakdown:

The Delta sleep mattress is the new entrant in the Australian bed-in-a-box market. The all-foam mattress is available in one firmness, which is medium (6/10). This medium firmness strikes a good balance between support and a soft cushiony feel, suitable for most average sized people.

This model has a simple two-layer construction. The top comfort layer and the main USP of the mattress is the 7cm thick memory foam, which the brand refers to as “Adaptive Comfort Technology”. The top layer has a neutral memory foam feel, and is designed to provide both cradling comfort and support. Unlike classic memory foam, which can often feel too hot or give a ‘sinking in’ feeling, the Delta Sleep uses porous memory foam which is quite effective in dissipating heat build-up, and providing a more balanced level of comfort.

Underneath the memory foam layer is an 8″ thick transitional high-density polyfoam that provides extra support and stability to the mattress.

In total, the mattress measures 10 inches thick, making it an average profile mattress that should fit most sheet sets. The mattress is encased in a removable Tencel fabric which is soft, natural and eco-friendly. It is also breathable and moisture-wicking which helps to absorb sweat and promote airflow.

All the foam used in the mattress and the outer cover are 100% recyclable and GECA (Good Environmental Choice Australia) certified. The mattress is manufactured in Victoria (Australia), unlike brands like Ecosa or Koala which are manufactured in China.

Delta Mattress Feel

Who may like the mattress?

Who may not like the mattress?

Tl;dr: If you are looking for a quality mattress that is made in Australia, then the Delta Sleep Mattress is an excellent option to consider.

Light to average sized sleepers, be it side, stomach or back, should find the mattress quite comfortable. Hot sleepers will also find the mattress ideal, and should not experience any significant heat retention. Heavier individuals may find the mattress a bit too soft, especially those who sleep on their side.

Delta Sleep Mattress

Delta Sleep mattress is a quality Aussie-made offering that should suit most sleepers, especially those who sleep hot. Click the button to save up to 10% on the mattress.

Fact Sheet

    • Outer cover is made from eco-friendly and breathable Tencel fabric.
    • 2-layer inner core encased in a protective sock: 7 cm memory foam, and 18 cm high-density polyfoam base.
    • GECA certified foams and encasing.
    • 120-night risk-free trial.
    • Free shipping within Australia.
    • Delivery time: 2 – 8 days.
    • Free mattress return pickup.
    • 10-year warranty.
    • Manufactured in Victoria, Australia.
Tencel Fabric Encasing

Size Options And Price Chart​

The Delta Sleep Mattress is available in all standard Australian bed sizes – Single, King Single, Double, Queen, and King. The mattress is pricier than some of the other all-foam mattresses on the market, but considering the quality of materials used, and the fact that it’s manufactured in Australia, the price is justified.

Sizes Dimensions (LxWxH) Height Box Dimensions Price (MSRP) Average Discount
Single 36″ x 74″ 10″ 14″ x 14″ x 46″ $795 $641
King Single 42″ x 80″ 10″ 14″ x 14″ x 46″ $921 $921
Double 54″ x 74″ 10″ 14″ x 14″ x 65″ $1,121 $1,011
Queen 60″ x 80″ 10″ 14″ x 14″ x 65″ $1,131 $1,021
King 72″ x 80″ 10″ 14″ x 14″ x 77″ $1,194 $1,084
Delta Sleep Mattress Label

Mattress Performance

Sleep temperature


The Delta Sleep Mattress does a good job of regulating temperature. The moisture-wicking Tencel fabric coupled with a porous top foam layer helps to dissipate heat, helping to prevent you overheating during the night. The mattress doesn’t actively cool down the sleeper, but it doesn’t trap heat as some memory foam mattresses do. The result is a cool, comfortable sleep environment.

Motion isolation for couples


The Delta Sleep Mattress performs well in terms of motion transfer, meaning that there is very little movement felt when someone gets in or out of bed. This is excellent for couples, as it means you won’t be easily disturbed by your partner’s movements at night.

Edge Support


Being a foam mattress, the Delta Sleep Mattress doesn’t offer the best edge support. However, we didn’t find this an issue when sleeping on the mattress, as the foam is dense and supportive.

We did notice some sinkage when sitting on the edge, but you don’t feel as if you’re going to fall off while sleeping.

Sex Comfort


The best mattress for sex is generally responsive and bouncy, allowing easy switching of positions, but every couple has different preferences. The Delta Sleep Mattress is cushioning with a slight sink to it allowing for more traction. Couples who don’t change positions often would find the mattress more comfortable. This is generally applicable for all types of foam mattresses. However, couples seeking a responsive and springier mattress might want to look at hybrid mattresses.

Overall, the Delta Sleep Mattress scores above average in sex comfort like most foam mattresses.



There was some off-gassing when we first unboxed the Delta Sleep Mattress, but this is to be expected with any foam mattress. The smell quickly dissipated and was unnoticeable within a few hours. It’s a good idea to leave your windows open for better ventilation to air out the new mattress smell.

Delta Mattress Cross Section

Sleeping Style and Body Weight

Side Sleepers:

The all-foam design and medium-firm feel of the Delta Sleep Mattress make it a great pick for side sleepers weighing under 105 Kg.

The 7 cm thick comfort layer offers an exceptional balance of pressure relief and contouring, ensuring that your hips, shoulders and spine are evenly aligned. Our testing found that side sleepers weighing below 105 Kg would be most comfortable as they sank just enough in the mattress to relieve pressure build-up across the body.

Side sleepers over the 105 kg weight limit would mostly find the mattress too soft. Heavier side sleepers compress the comfort layer too much around the shoulder and hip region, which could cause discomfort and body misalignment.

Back Sleepers:

Back sleepers prefer medium to medium-firm mattresses. With a medium firmness, the Delta Sleep Mattress is also a suitable option for back sleepers, except for those who weigh over 105 kg. The mattress offers an even stable surface to keep the spine aligned while still offering decent cushioning.

Back sleepers weighing over 105 kg may find that the mattress is too soft, causing them to sink in too deeply and not provide enough support for the spine. Heavier individuals are better supported on firmer hybrid or innerspring mattresses.

Stomach Sleepers:

Stomach sleepers need a firmer mattress to keep their hips from sinking in too deeply, causing spinal misalignment and preventing pressure point formation. Light to medium weight stomach sleepers (less than 75kgs) are most likely to find the Delta Sleep Mattress comfortable. However, stomach sleepers weighing over 75 kgs might not experience adequate support on the mattress and feel more supported on a firmer mattress.

 Under 60 Kg60 to 105 KgAbove 105 Kg
Side SleepersGoodExcellentPoor
Back SleepersGoodExcellentFair
Stomach SleepersExcellentGoodFair

Company Policies

When buying a mattress, it’s important to know and understand the fine print.

Return policy

If you decide the Delta Sleep Mattress isn’t for you, you can return it within 120 days for a full refund. This is pretty standard for online mattress brands.

The pickup is free, and the company claims to process the refund in less than a week after the mattress reaches its warehouse.

Shipping and Delivery

The Delta Sleep Mattress is shipped right to your doorstep in a compressed box. What’s even cooler is that the box comes fitted with two wheels, making it easier to maneuver around your home. Once you unbox the mattress, it takes about 24 to 48 hours for the mattress to decompress fully.

The shipping is free within Australia, and is handled by Unitrans. Delivery takes anywhere from 2 to 8 days. In our case, we received the mattress at our Sydney address in two days.


The Delta Sleep Mattress comes with a 10 year warranty, which is average for the industry. The warranty covers any any physical damage, major blemishes, flaws, manufacturing defects and sinkage that is more than one inch or 2.54 cm. The warranty does not cover normal wear and tear or damages caused by improper use (cleaning, maintenance, treatment).

Delta Sleep

Delta Sleep mattress is a quality Aussie-made offering that should suit most sleepers, especially those who sleep hot. Click the button to save up to 15% on the mattress.

James Lee

James Lee

James is the content director at WhatASleep, a certified sleep science coach from Spencer Institute and our in-house sleep product expert. Over three years, he's personally tested hundreds of mattresses. He likes to keep his reviews simple, objective, and straightforward so that the readers don't have to go through decision fatigue which is often the case while shopping for sleep products.

He hails from Sydney and has a journalism degree from the University of Queensland and an MBA from Melbourne Business School.

Delta Sleep Mattress


WhatASleep Score

Support: 4.2/5
Cooling: 4.5/5
Durability: 4/5
Trial Period: 4.5/5
Warranty: 4.5/5

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