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Comfort trial

Comfort fillings
Firmness rating

Support system
Handmade with 1400 individual pocket springs, enjoy extra firm orthopaedic support combined with luxurious fresh fillings for the ultimate in comfort.

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

Soft synthetic fillings create an incredible cosy feel. These fillings are durable and resilient, maintaining its shape and quality. A great balance between comfort and value for money.

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.

Helping to promote a healthy sleeping position. Orthopaedic support is specially designed to provide enhanced spinal alignment, joint support and improve posture.
Our firmest rating. Highly supportive with a very firm, sturdy feel

About 10 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.

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.

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
The Adleborough 1400 Pocket Ortho Mattress by Rest Assured perfectly encompasses extra firm support, comfort and luxury.
Pocket sprung support
This mattress is handcrafted with 1400 pocket springs that adapt to your movements and unique shape throughout the night. The innovative pocket springs distribute your weight evenly whilst giving you soothing pressure relief to aches and pains.
Orthopaedic feel
This amazingly high spring count in an extra firm feel enables personalised back support to the areas you need it most. This mattress is specially designed to enhance back support. It truly cares for your back.
If you are looking for a mattress that is a little softer, check out the Novaro 1000 Pocket Ortho Mattress by Rest Assured. With all the benefits of an orthopaedic mattress, just with a medium feel!
Handmade quality
Sumptuous comfort fillings create a luxuriously cosy feel to perfectly complement the high levels of orthopaedic support this mattress offers. Hand-tufted throughout, the plush fillings are firmly secured in place to ensure longer-lasting support, comfort and durability - exactly what you need for a great night's sleep, night after night.
Sleep peacefully
The Rest Assured Adleborough is free from foam and chemical treatments. The clean and fresh mattress cover eliminates the risk of mould and dust mites without the use of harsh chemicals. It's finished with air vents along the border, which improve airflow for a fresher, healthier sleep environment.
No flips here
Easy to care for, this mattress is single-sided so there's no need to turn over the Adleborough. Simply use the built-in turning handles to rotate it, top-to-bottom, to keep it in the great condition you expect.
Weights: Single: 23.5kg, Double: 33.5kg, King Size: 41.5kg, Superking: 49.5kg
This mattress comes with a 100-Night Comfort Trial - like all of our mattresses!
The trial lets you test your mattress for up to 100 nights. If it's not quite right for you, you can exchange it for a new one. To be eligible for the Comfort Trial, you'll need to purchase a mattress protector from MattressOnline with your new mattress.
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.
We deliver across the UK, with some remote areas offering alternative delivery options. Enter your postcode below to check which delivery options are available in your area.
Enjoy fast, reliable UK delivery with a delivery time slot confirmed on the morning of your delivery, live tracking and drop-off at your front door - or building entrance if you live in an apartment.
England FREE Delivery is free across England. Select postcodes in Cornwall, Cumbria and Lancashire are delivered to on set days rather than next day. |
Wales FREE Delivery is free across Wales. Select postcodes are delivered to on set days rather than next day. |
Scotland FREE or £40 The majority of Scottish postcodes are free, including Glasgow and Edinburgh. Select areas, including Aberdeen, Dundee, the Highlands and the islands, have a £40 charge. Select postcodes also require a longer delivery lead time. |
Northern Ireland £60 All BT postcodes have a £60 delivery charge and require 3 working days for delivery. |
Please use the postcode checker above for delivery information accurate to your address. For more information, head to our Delivery Page.
Delivery to a Room of Your Choice £20.00 We'll take the item to a room of your choice (excludes unpackaging) |
Mattress Recycling £35.00 We'll collect your old mattress and recycle it when we deliver your new one. |
| Firmness | Extra firm |
| Comfort fillings | Soft White Fibres, Tufted |
| Support system | Pocket Springs |
| Pocket spring count | 1400 |
| Back care | Orthopaedic support |
| Cover | Damask cover |
| Border | Air vents |
| Turning handles | |
| Single-sided | |
| Guarantee | 5 years |
| Size | Width | Length | Depth |
|---|---|---|---|
| Single | 90cm | 190cm | 25cm |
| Double | 135cm | 190cm | 25cm |
| King Size | 150cm | 200cm | 25cm |
| Superking | 180cm | 200cm | 25cm |
Please allow for a tolerance of +/- 2cm
| Handcrafted in the UK | |
| Approved by the National Bed Federation | |
| Fire resistance | Conforms to BS7177: 2008, for use at home |
A balanced snapshot of what customers love (and what they don't), generated by AI.
Was very similar to our last mattresses. Nice and firm. Very comfortable
Verified Purchase
Had great review so we ordered but for us far too firm had to send back
Verified Purchase
Reply from MattressOnline.co.uk, 14 days ago
Hello Lisa I am sorry you are not finding your mattress comfortable - we appreciate the feedback. Thank you for reaching out to our team. We're glad we helped arrange collection of the mattress so that you could purchase an alternative that is more to your comfort levels. Kind regards Charlie
This is the best firm-yet-comfy mattress I’ve ever tried
Verified Purchase
As expected
Verified Purchase
Good quality and comfortable.
Verified Purchase
It is the most fabulous sleep I have had in years and I do not awake with an aching body. It was recommended to me and I in turn also highly recommend it to others.
Verified Purchase
It is a great mattress, very comfortable and nice and firm.
Verified Purchase
The speed and efficiency were truly appreciated. The quick delivery exceeded expectations. It's refreshing to experience such prompt service. This level of efficiency makes a positive impact. We value the timely manner in which everything was handled.
Verified Purchase
Perfect nights sleep, and no longer waking up with back ache.
Verified Purchase
Excellent service received From start to finish.
Verified Purchase
1
Mon-Sat: 09:30am - 5:30pm
Sunday: 10am - 4pm
Mon-Sat: 09:30am - 5:30pm
Sunday: Closed
customerservice@mattressonline.co.uk