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Comfort trial

Comfort fillings
Firmness rating

Support system
Give your back the support it needs. The Harlow Ortho Plus provides a firm orthopaedic support to soothingly align your spine.

An innovative spring design from the specialists at Sealy that uses unique shapes and varied tension to provide excellent full-body support and pressure relief.

Helping to promote a healthy sleeping position. Orthopaedic support is specially designed to provide enhanced spinal alignment, joint support and improve posture.

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.

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!
Firmer and more supportive

About 10.2 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.

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
Give your back a break and experience dream-worthy support with the Sealy Harlow Ortho Plus Mattress. The relieving firm orthopaedic support helps you fall into a deep, undisturbed sleep.
Exclusive to Mattress Online, you won't find this mattress anywhere else!
Targeted support
This mattress is made up of a unique PostureTech Core Support coil spring system. Sealy's spring system has been engineered to give you the ultimate support needed. The spring system reacts to the weight and movement that has been applied, adapting to become gradually firmer.
This smart system offers targeted deep support, perfect if you have back issues or need a bit more support.
That ortho feeling
A comfort rating of firm is perfect for those who experience back issues, aches and common pains. Orthopaedic technology offers optimal push-back against pressure points. Allowing for total support and alignment all night long. This reduces tossing and turning during the night so you can get a peaceful night's sleep.
This mattress has a tufted sleep surface, allowing for a sturdy, firmer feel. Increasing the support for a night of truly restorative sleep.
Cushioned comfort
Filled with soft synthetic fibres that provide the perfect amount of comfort to cushion the hardest parts of the body. With the firm feel, the plush fillings help keep you in an uninterrupted sleep all night long.
All of Sealy's mattresses are 100% recyclable once you are finished with them. At the end of its life, no part of this mattress ends up in landfill. The mattress comes with a 5 Year Guarantee, so you can buy with confidence and put sustainability first!
Weights: Single: 16kg, Small Double: 18kg, Double: 24kg, King Size: 27.5kg, Superking: 32.5kg
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 | Firm |
| Comfort fillings | Soft White Fibres |
| Support system | PostureTech Core Support Springs |
| Back care | Orthopaedic support |
| Cover | Damask cover |
| 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 | Sealy Product Care and Guarantee |
| Size | Width | Length | Depth |
|---|---|---|---|
| Single | 90cm | 190cm | 26cm |
| Small Double | 120cm | 190cm | 26cm |
| Double | 135cm | 190cm | 26cm |
| King Size | 150cm | 200cm | 26cm |
| Superking | 180cm | 200cm | 26cm |
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.
I am not happy with the Firm Mattress that has pockets in it to support the Spine : I want to Change it to an Extra Firm Mattress without pockets in it to support Spine :
Verified Purchase
Reply from MattressOnline.co.uk, 1 month ago
Hi Shiv I am sorry you are not finding your mattress comfortable - we appreciate the feedback. The mattress you have purchased does come with a 60-night Comfort Trial; if you are not finding it comfortable you would be more than welcome to exchange this for something more suitable. If you would like to make contact with our Customer Service team on 01709 780881 or customerservice@mattressonline.co.uk, we can discuss the options with you. Kind regards Charlie
Bad quality
Verified Purchase
Just the job for me, all the comfort and support for a good night's sleep
Verified Purchase
Very high quality comfortable mattress
Verified Purchase
Lovely mattress if you sleep on back or stomach. However Not suitable if you sleep on your side.
Verified Purchase
Not the quality I am used to expecting from Sealy. I have used this brand before, and the mattress I have does not match up in the least11
Verified Purchase
its good mattress.very easy to turn over.
Verified Purchase
It's completely not supportive to the back. I'm just 100 pounds. But the bed is simple sank when I slept on it. I can't imagine that they said the firmness is at level 4. I have a back pain after I slept for a week.
Verified Purchase
Competitively price, good on the day delivery time info, friendly and helpful delivery team, excellent mattress.
Verified Purchase
Mattress fails to rebound and depths of body remain.
Verified Purchase
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customerservice@mattressonline.co.uk