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100 Night Sleep Trial

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Features you'll love

Support System

Open Coil Springs

Lattice shaped high tensile steel springs give a traditional, durable support.

Comfort Fillings

Soft White Fibres

100% polyester offers great recovery and durability, meaning long-lasting comfort.

Firmness

Extra Firm

The firmest level of support. Also known as orthopaedic.

Description

For specialist support, the Spring King® Ruby Ortho Extra Firm Mattress is one of the firmest sleep surfaces you can find. For those of a particularly heavy build, those who have been recommended an extra firm mattress by a medical professional, or anyone who simply feels they need specialised help with back pain, this orthopaedic mattress can help to align your spine for a more comfortable sleeping position.

Consistently firm support

A traditional open coil spring unit features one continuous high tensile spring formed into a lattice shape. This innovative shape allows for a firmer, more consistent level of support, while a deep, firm filling of breathable white fibres ensures targeted pressure relief exactly where you need it. This expert level of tension relief can help you enjoy a more rejuvenating, refreshing night's sleep, with the enhanced air circulation within the mattress preventing overheating and encouraging a fresher sleeping environment.

Double-sided for even wear

Luxuriously hand-tufted to keep all fillings in place, the Spring King® Ruby Ortho Extra Firm Mattress is finished with a soft damask cover for a final touch of luxury. Double-sided, this mattress features robust turning handles to help you flip it each season, ensuring even distribution of fillings.

1276940-5056314410115

Features

Open Coil Springs

These spring systems contain interlaced coils of high-tensile steel that are joined together in a lattice, for great body support. Most common sprung mattresses are made using these open coil springs.

Soft White Fibres

Soft white fibre fillings which are made from 100% polyester. This type of mattress filling offers great recovery and is very durable, which means long-lasting comfort.

27cm Depth

This mattress is approximately 27cm deep.

Damask Cover

A mattress cover which is made from a breathable Belgian damask fabric.

Orthopaedic Support

Designed to offer a firmer sleep surface, providing targeted support for your back and joints.

Reinforced Edges

The mattress has reinforced edges, so that the full sleep surface can be used. This means more sleeping space - which is usually lost in conventional, less edge-stable mattresses.

Turning Handles

Flag-stitched handles are attached to the sides of the mattress to assist in turning or rotating.

Hypoallergenic

Being hypoallergenic, this is the perfect item for allergy sufferers - or anyone looking for a healthy night's sleep.

Turnable

The mattress has fillings on both sides. Double-sided mattresses need to be turned regularly to keep them in good condition.

Hand Tufted

Tufts help to secure the luxury fillings in place, helping the mattress retain it's fullness and plumpness over time.

Flat Mattress

This mattress will arrive flat, not rolled and boxed.

Made in the UK

This item has been manufactured in the UK.

Fire Resistant - Low Hazard

This product conforms to the BS7177: 2008 standard for domestic use (low hazard) - ideal for use at home.

Benefits

An open coil spring unit provides extra firm support to your entire body
Deep layers of soft white fibres enhance both the firm feel and comfort of the mattress
Enhanced air circulation prevents overheating and allows for a fresher sleep
Hand-tufted to ensure all fillings stay in place, this mattress is flippable to ensure even distribution
A soft damask cover adds a final touch of luxury, while reinforced edges maintain the mattress' structure

Highly Rated

You've got the best price

As Online Bed Retailer of the Year 2025 - 2026, you can trust us to get you the best price. With our fast delivery and exceptional service, you won't find better elsewhere.

Spring King® Ruby Ortho Extra Firm Mattress

4.8 out of 5

5 Star (88)

4 Star (13)

3 Star (1)

2 Star (1)

1 Star (1)

Experience superior spine support for a restful, pain-free night's sleep.

Open Coil Springs

Soft White Fibres

27cm Depth

Firmness: Extra Firm

£239

RRP £399

Save £160

from £239

Size

Single 3' x 6'3"

£239 RRP £399

Only 3 left

Small Double 4' x 6'3"

£259 RRP £439

7-10 Days

Double 4'6" x 6'3"

£259 RRP £439

In stock

King Size 5' x 6'6"

£319 RRP £539

In stock

Super King 6' x 6'6"

£439 RRP £739

7-10 Days

FREE Delivery within Next Day

FREE delivery Tuesday, 17th March
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Description & Features

Consistently firm support

Double-sided for even wear

Open Coil Springs

Soft White Fibres

Soft white fibre fillings which are made from 100% polyester. This type of mattress filling offers great recovery and is very durable, which means long-lasting comfort.

27cm Depth

This mattress is approximately 27cm deep.

Damask Cover

A mattress cover which is made from a breathable Belgian damask fabric.

Orthopaedic Support

Designed to offer a firmer sleep surface, providing targeted support for your back and joints.

Reinforced Edges

The mattress has reinforced edges, so that the full sleep surface can be used. This means more sleeping space - which is usually lost in conventional, less edge-stable mattresses.

Turning Handles

Flag-stitched handles are attached to the sides of the mattress to assist in turning or rotating.

Hypoallergenic

Being hypoallergenic, this is the perfect item for allergy sufferers - or anyone looking for a healthy night's sleep.

Turnable

The mattress has fillings on both sides. Double-sided mattresses need to be turned regularly to keep them in good condition.

Hand Tufted

Tufts help to secure the luxury fillings in place, helping the mattress retain it's fullness and plumpness over time.

Flat Mattress

This mattress will arrive flat, not rolled and boxed.

Made in the UK

This item has been manufactured in the UK.

Fire Resistant - Low Hazard

This product conforms to the BS7177: 2008 standard for domestic use (low hazard) - ideal for use at home.

An open coil spring unit provides extra firm support to your entire body
Deep layers of soft white fibres enhance both the firm feel and comfort of the mattress
Enhanced air circulation prevents overheating and allows for a fresher sleep
Hand-tufted to ensure all fillings stay in place, this mattress is flippable to ensure even distribution
A soft damask cover adds a final touch of luxury, while reinforced edges maintain the mattress' structure

1276940-5056314410115

Spring King® 1 Year Guarantee

Spring King® 1 Year Guarantee

Spring King are certain you'll love your new mattress, but in the unlikely event you discover a problem as a result of faulty materials or poor crasftmanship, you're covered by a one year guarantee.

100 Night Sleep Trial

Finding the perfect mattress shouldn't be stressful. That's why we offer a generous 100 night sleep trial. Snuggle in and test it out for at least 50 nights. If it's not your perfect match we’ll offer you an exchange for a mattress that you love even more.

Delivery & Recycling

We provide our award-winning Free Next Day Delivery service to most locations, sending a proper night’s sleep out far and wide. Hassle-free and convenient, you can even choose a time and day that suits you, have us take your old mattress away for recycling, and get us to deliver to your room of choice!

In some places, a small fee will be charged to help us get you your best night’s rest as quickly as possible. Take a look at the following postcodes to see if this applies to you, and if you’re not sure, then use our helpful Postcode Checker to help you shop with confidence.

AB10-AB16, AB21-AB25, AB30-AB39, AB41-AB45, AB51-AB56
CA1-CA9
DD1-DD11
DG1-DG14, DG16
EH1-EH49, EH51-EH55, EH91, EH95, EH99
FK1-FK21
G1-G5, G9, G11-G15, G20-G23, G31-G34, G40-G46, G51-G53, G58, G60-G79, G18-G84, G90
IV1-IV19, IV30-IV32, IV36
KA1-KA30
KY1-KY16, KY99
LA1-LA7
ML1-ML12
PH1-PH26
TD1-TD15

Old Mattress Removal

For just £39, our fast and friendly team will collect your old mattress at the exact same time we deliver your new one. No waiting, no heavy lifting, and no clutter. 100% of your old mattress is carefully recycled and kept out of landfill. Simply select 'Old Mattress Removal' at checkout.

Sustainability

Your order helps us plant trees

151,670+ Trees planted so far

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Your order helps us plant trees

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Free, fast delivery

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Mattress recycling

Planet-friendly disposals

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Spring King® Ruby Ortho Extra Firm Mattress

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Customer Verified

14th May 2023 14th May 2023

Verified

Verry happy with the mattress. T…

User Generated Content - An image regarding this review

Verry happy with the mattress. This truly firm mattress. As for our liking most firm mattresses are just too soft, but this was very firm. Edges suported, so not dipping as much as other mattresses then sitting on a side of the bed. Quite thick. No noise. Looks way more expensive. Great quality. So far two weeks, very good sleep.

Customer Verified

14th May 2023 14th May 2023

Verified

Verry happy with the mattress. T…

Customer Verified

14th May 2023 14th May 2023

Verified

Verry happy with the mattress. T…

Augusta Verified

17th September 2023 17th Sep 2023

Verified

I am enjoying the the small doub…

I am enjoying the the small double mattress. Lovely and firm. Also looks good.Excellent website and prompt delivery. Excellent service.

Colin Hammond Verified

20th January 2025 20th Jan 2025

Verified

This mattress has exceeded our e…

This mattress has exceeded our expectations. For the this price rangewe are pleased to find that the quality of this mattress affords us a very comfortable night's sleep. It is a very firm grade which we find better for our needand is very stable when one or other gets in or out of the bed. It is also much lighter than other mattresses which is great for us in our later years when it is time to turn it. Can't fault this mattress at all,great price, great comfort, great sleepand a great company with excellent prompt next day delivery.Our purchase couldn't have been easier.Many thanks

Louiseanne Mccaig Verified

2nd June 2025 2nd Jun 2025

Verified

Comfort plus +++ no more sore ba…

Comfort plus +++ no more sore back, getting a full night's sleep and waking up content from sleeping well, it's really firm but perfect for larger body frame.

Hugh Verified

15th December 2025 15th Dec 2025

Verified

A very good mattress that works…

A very good mattress that works well with a memory foam topper. Very good value for money. It may increase the height of your bed by 4inches.

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*Delivery charges may apply for some areas. Please see our delivery page for more information.
1. Order by 6pm for next day delivery between Monday-Friday, 12pm on Saturday and 3pm on Sunday. The 'Order by' time may be subject to change dependant on our delivery partners.

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MattressNextDay, 116 Joseph Wilson Industrial Estate, Whitstable, Kent, CT5 3SN

Features you'll love

Consistently firm support

Double-sided for even wear

Spring King® Ruby Ortho Extra Firm Mattress

Consistently firm support

Double-sided for even wear

Old Mattress Removal

Rated Excellent

Customer Review Summary

Reviews with images

Frequently paired with

More Extra Firm Mattresses

More with Pocket Springs

More from Spring King®

You might also like

More to explore

Your order helps us plant trees

Free, fast delivery

Mattress recycling

0% Interest finance

Spring King® Ruby Ortho Extra Firm Mattress

£

Pair it with

Verry happy with the mattress. T…

Verry happy with the mattress. T…

Verry happy with the mattress. T…

I am enjoying the the small doub…

This mattress has exceeded our e…

Comfort plus +++ no more sore ba…

A very good mattress that works…