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Comfort trial

Comfort fillings
Firmness rating

Support system
Made with premium wool, cashmere and silk comfort fillings for a more relaxing night's sleep.

Individualised springs encased in cloth pockets. Expertly adapting to movement to distribute personalised support to each part of your body.

A luxuriously soft and gentle natural filling. Cashmere is incredibly breathable and has great moisture-wicking properties. Lightweight and flexible for optimal support.

Luxurious and natural, silk provides sumptuous comfort whilst creating a breathable and resilient sleeping environment.

Stay snuggly all night long. Perfect all year round, wool is a natural insulator and has great temperature regulating properties.

A damask cover is a finely woven and durable fabric that is soft to touch. This cover doesn't retain heat and has a long-lasting performance.

Free of allergens for a cleaner, healthier sleep. No allergenic materials were used so you can enjoy an undisturbed rest without the risk of allergy reactions or respiratory problems.

Enhances air circulation through the mattresses for a fresher feel. Prevents moisture build-up, creating a more hygienic environment.

A traditional and elegant design that holds fillings in place whilst enhancing the stability of the mattress. The luxurious tufting ensures zero shifting, shape loss or sagging.
Our firmest rating. Highly supportive with a very firm, sturdy feel

About 11.4 inches deep. Depth is an important factor when buying a mattress as it can affect the suitability for particular bedding, mattress toppers and bed frames.

With a single-sided mattress, there's no need to flip. Simply rotate every few months to care for your mattress. Fuss free mattress maintenance!

Stitched into the mattress border, turning handles are there for easier moving and turning. When caring for your mattress, simply use the handles provided for ease of use.

Free from harsh chemicals or irritants or allergens, this product is treated with a natural fire retardant formula. Better for you and the environment.

For your peace of mind

Expertly handcrafted in the UK. This product helps to support our economy and helps to reduce environmental impact.

This product conforms to BS7177: 2008, for use at home

For the highest standards of quality and safety
Extra-firm support
Featuring very high levels of extra-firm support, this mattress is a great choice if you love a sturdy, firmer feel. The Northington perfectly blends fine, natural fillings and 2000 individual pocket springs, to create a highly supportive mattress.
Natural secure fillings
The high-quality wool, cashmere and silk comfort fillings are densely packed to create a firm-feel sleep surface that will benefit your back and joints. As well as being comfortable, the natural fillings are breathable and provide natural temperature control to ensure you won't get too warm during the night.
This natural, springy comfort layer is long-lasting, durable and has been traditionally hand-tufted to secure the fillings. Not only does hand-tufting provide many years of high-performance use, it also further enhances the firmer level of support you'll feel.
Personalised support
2000 responsive pocket springs support the entire length of your body. The springs are zoned to provide targeted support to areas such as the back, hips and joints. The Northington is an excellent choice if you often struggle with back pain.
The individual pocket springs move independently, reacting to the contours of your body and absorbing movement to prevent partner disturbance during the night. This level of personalised support will ensure you feel well-rested every morning and ready to tackle the day ahead.
A clean, fresh surface
Rest Assured have also taken steps to ensure that your mattress stays clean, fresh and allergen-free. It's free from foam and chemical treatments and it's hypoallergenic too. You can sleep peacefully knowing your sleep won't be interrupted by itchy eyes or sneezing fits.
No flips here
This mattress is single-sided - this means there's no need to flip it over. Simply rotate top-to-bottom once a week for the first three months, and then monthly thereafter. This will prolong the longevity of your mattress and ensure even wear across its surface.
Got you covered
This mattress has been handcrafted in Lancashire, the heart of the British countryside - with the benefit of over 100 years of expertise. Rest Assured provides premium mattresses you can trust, with each item being covered by a 5 Year Guarantee for total peace of mind.
Please note: we're currently in the process of changing the cover of this mattress, so the model you receive may differ slightly in appearance from the one pictured.
Weights: Single: 32kg, Double: 48kg, King Size: 56kg, Superking: 67kg
This mattress comes with a 60-Night Comfort Trial - like all of our mattresses!
The trial lets you test your mattress for up to 60 nights. If it's not quite right for you, you can exchange it for a new one.
It can take some time to get used to a new mattress, which is why we ask you to sleep on your mattress for 30 nights. If you're not happy with the feel after 30 nights, simply contact our Customer Service Team, and we'll arrange a mattress exchange.
| Firmness | Extra firm |
| Comfort fillings | Cashmere, Silk, Wool, Tufted |
| Support system | Pocket Springs |
| Pocket spring count | 2000 |
| Cover | Damask cover |
| Allergy care | Hypoallergenic |
| Border | Air vents |
| Turning handles | Yes |
| Single-sided | Yes |
| Guarantee | 5 years |
| Awards & accreditations | Handcrafted in the UK, Approved by the National Bed Federation |
| Fire resistance | Conforms to BS7177: 2008, for use at home |
| Downloads | Rest Assured Product Care and Guarantee |
| Size | Width | Length | Depth |
|---|---|---|---|
| Single | 90cm | 190cm | 29cm |
| Double | 135cm | 190cm | 29cm |
| King Size | 150cm | 200cm | 29cm |
| Superking | 180cm | 200cm | 29cm |
Please allow for a tolerance of +/- 2cm
The following delivery methods apply to mainland England and most of Scotland, Wales and Northern Ireland. Please read our delivery page for more information.
Next day delivery (weekdays only) Order before | FREE |
Weekday of your choice Order up to 60 days ahead | FREE |
Weekend On Saturday or Sunday of your choice | £17.50 |
Delivery to the front door of your building Free upgrade for Double, King Size and Superking to your room of choice | Yes |
Two-hour delivery time slot We’ll let you know on the day before your delivery | Yes |
Call to let you know we’re on our way On your delivery day | Yes |
Delivery to your room of choice Free upgrade for Double, King Size and Superking | £20.00 |
Mattress recycling We'll take away your old mattress | £35.00 |
Delivery is on an all-day service, 7am - 8pm for mainland England and most of Scotland, Wales and Northern Ireland.
Need further information? Please visit our Delivery page.
A balanced snapshot of what customers love (and what they don't), generated by AI.
Fantastic mattress. Sleep is so much better now & not waking up with aches & pains!
Verified Purchase
The mattress is very firm which is what I was after. However, it is also very heavy which makes it quite challenging to even rotate it regularly.
Verified Purchase
The delivery crew are super reliable, quick and professional. The mattress is high quality and extra firm, the material of wool provided a warm bed experience on winter nights, highly recommended to have one if you need a warm and very firm mattress.
Verified Purchase
Very solid mattress beautifully made, the only thing for me is it's very heavy to turn or tuck my sheets in .I have a back problem so t bought a mattress topper and it is beautiful so I sleep like a baby . The mattress has not moved and no indentations so I am very happy many thanks.
Verified Purchase
It's what I was expecting I'm very pleased with it. Firm and comfortable
Verified Purchase
It's hard to find a firm enough mattress but this one is super firm and supportive!
Verified Purchase
Excellent and comfortable one.
Verified Purchase
Comfortable and firm mattress
Verified Purchase
Excellent quality and craftsmanship. It looks great and feels great. I was unsure how long it would take to get used to a firmer bed but within two days I was getting a better sleep than my previous bed.
Verified Purchase
Got exactly what I wanted
Verified Purchase
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Sunday: 10am - 4pm
Mon-Sat: 09:30am - 17:30pm
Sunday: Closed
customerservice@mattressonline.co.uk