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Sealy Harlow Ortho Plus Mattress

Sealy Logo
From£314.95

up to

20% off

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.

Reasons to Buy

PostureTech Core Support Springs
PostureTech Core Support Springs

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.

Orthopaedic support
Orthopaedic support

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

Soft White Fibres
Soft White Fibres

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.

Damask cover
Damask cover

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.

Single-sided
Single-sided

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!

Firm
Firm

Firmer and more supportive

26cm deep
26cm deep

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.

5 Year Guarantee
5 Year Guarantee

For your peace of mind

Handcrafted in the UK
Handcrafted in the UK

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

Fire Resistant
Fire Resistant

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

National Bed Federation Approved Brand
National Bed Federation Approved Brand

For the highest standards of quality and safety

Description

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!

Benefits

  • Exclusive to Mattress Online!
  • Unique Posture Tech Core Support spring system
  • Designed to support the heaviest parts of your body
  • Firm orthopaedic feel
  • Ideal for elevated back support
  • Plush synthetic fibres
  • Tufted for a firmer, sturdier feel
  • Ensures correct spinal alignment
  • 100% recyclable at the end of the life cycle
  • Single-sided
  • Depth: 26cm
  • Made in the UK
  • 5 Year Guarantee

    Weights: Single: 16kg, Small Double: 18kg, Double: 24kg, King Size: 27.5kg, Superking: 32.5kg

60-Night Comfort Trial

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.

Click here for more info about our 60-Night Comfort Trial.

Videos

Sealy Harlow Ortho Plus Mattress

Specification

FirmnessFirm
Comfort fillingsSoft White Fibres
Support systemPostureTech Core Support Springs
Back careOrthopaedic support
CoverDamask cover
Single-sidedYes
Guarantee5 years
Awards & accreditationsHandcrafted in the UK, Approved by the National Bed Federation
Fire resistanceConforms to BS7177: 2008, for use at home
DownloadsSealy Product Care and Guarantee

Dimensions

SizeWidthLengthDepth
Single90cm190cm26cm
Small Double120cm190cm26cm
Double135cm190cm26cm
King Size150cm200cm26cm
Superking180cm200cm26cm

Please allow for a tolerance of +/- 2cm

Delivery

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.

Reviews

4.5/5

out of 352 reviews onTrustpilot logo

Product review stars

Customer Reviews Summary

summarised by AI

1 starsShiv
31 January 2026

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

2 starsFlorida
7 December 2025

Verified Purchase

5 starsJohn
13 August 2025

Verified Purchase

5 starsNgozi
24 June 2025

Verified Purchase

3 starsM
2 May 2025

Verified Purchase

3 starsSally
11 January 2025

Verified Purchase

4 starsManu
8 January 2025

Verified Purchase

1 starsKelly
20 October 2024

Verified Purchase

5 starsFiona
8 October 2024

Verified Purchase

2 starsKashyap
19 May 2024

Verified Purchase

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