Rock Hard Ultra Firm New Images 2025 Full MattressRock Hard Ultra Firm New Image 2025 SideRock Hard Ultra Firm New Image 2025 FrontRock Hard Ultra Firm New Images 2025 Full MattressRock Hard Ultra Firm New Image 2025 Side

Rock Hard Ultra Firm Mattress

Mattress Online Logo
FromÂŁ269.95

up to

30% off

Comfort trial

Comfort fillings

Firmness rating

Support system

The Rock Hard Ultra Firm Mattress delivers orthopaedic support at an affordable price point. If you suffer from back pain or like the firmness of the floor, then this is the perfect fit for you. Designed with two high density foams to create our firmest mattress ever!

Reasons to Buy

Reflex Foam
Reflex Foam

Supportive foam that promotes spinal alignment and a personalised sleeping experience by moulding to your body. It is durable and resilient and it holds its shape for an extended period of time.

Reflex Foam
Reflex Foam

Soft and flexible reflex foam enhances the support needed for excellent spinal alignment. The sumptuous nature doesn't compromise on the cosy comfort either.

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.

Extra Firm
Extra Firm

Our firmest rating. Highly supportive with a very firm, sturdy feel

Hypoallergenic
Hypoallergenic

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.

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!

Washable cover
Washable cover

Enjoy the feeling of a crisp, fresh mattress with a washable cover. It renews the freshness of your bed with ease for a hygienic and healthy rest.

Removable cover
Removable cover

Removable covers are convenient and keep mattress maintenance simple. Easily remove the cover and wash to preserve the mattress quality.

25cm deep
25cm deep

About 9.8 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.

3 Year Guarantee
3 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

Wave goodbye to to your back pain with our firmest ever mattress! The Rock Hard Ultra Firm Mattress is crafted with strong, extra firm foam to deliver that supportive, floor-like feel you've been searching for!

Our firmest mattress!

This mattress has been designed with ultimate orthopaedic support in mind that is why it is rated extra firm. Firmer mattresses are an ideal choice for back sleepers and those who suffer from back pain. This is because the firm surface stops your body from sinking too deep. Which can often lead to an unnatural spine curvature and a loss of support. Firmer mattresses keep your body resting perfectly on the mattress surface so your spine is in soothing alignment.

Our Rock Hard range includes three incredible firm mattresses. With the Ultra being at the top of the firmness range, it’s followed closely by the Mega Firm and the Super Firm.

Responsive tailored care

Delve into sumptuous goodness with the reflex layer. Specially used for its ability to respond to movement and your body. This allows it to follow you as you move around and change sleeping positions so you can experience 24/7 support. The foam wraps around your delicate contours to effortlessly lift pressure off your muscles and joints.

Extra support

A layer of ortho PU foam helps to add extra support within the mattress interior. Highly adaptable, the foam encases you in its supportive comfort. Moulding to your shape, the foam can excellently reduce pressure points and encourage better posture. Keeping your spine in correct and soothing alignment with your neck, shoulders and hips.

Restful sleep

If you suffer from allergies and it affects the quality of your sleep then this hypoallergenic mattress is perfect for you. This feature protects you against skin and health irritation that can leave you with a disturbed rest. Allergens such as hayfever and dust mites can have you sneezing and itching relentlessly but you can wave goodbye to that feeling with this mattress.

Cosy freshness

Covered in a soft stretch knit fabric, you can rest against a perfectly cosy surface. Kind to skin, the fabric is made from polyester material. Highly breathable, this material offers subtle moisture dispelling and temperature regulation.

To keep it feeling soft and nice, the cover is removable and dry clean is recommended. So you never have to fret about spills, stains or accidents!

Simple care

Holding a single-sided design, it should be noted that you don’t have to worry about strenuously flipping it. Instead rotate your mattress top to toe on a monthly basis. Keeping up with this care routine will grant the mattress a longer life, free from dints, dips, discolouration and odour build up.

Quality you can trust

The entirety of this mattress has been made in the UK. This means it has met all the required safety standards to deliver safe comfort. Includes a 3 Year Guarantee for further reassurance.

Disclaimer: The knitted cover fabric may feature a different design than what is pictured above. This does not affect the quality and comfort of the mattress.

Benefits

  • Our firmest mattress ever promotes a perfect hard surface
  • Sumptuous layer of reflex foam
  • Specialised orthopaedic structure with extra firm rating
  • Targeted back pain care
  • Effortlessly aligns your spine, neck and hips
  • Designed to embrace your body with supportive comfort
  • Excellently lifts pressure off your joints, reducing aches
  • Highly adaptable and responsive for personalised care
  • Helps you ease into a deep sleep
  • Ortho PU foam layer enhances the soothing support
  • Meeting you with secure care in every position
  • Perfectly hypoallergenic, protecting against allergen irritation
  • Soft stretch knit fabric surface is kind to skin
  • Feel fresh and clean with the removable and dry clean cover
  • Single-sided, rotate top to toe on a monthly basis
  • Made in the UK
  • Depth: 25cm
  • 3 Year Guarantee

60-Night Comfort Trial

This mattress comes with a free 60-night comfort trial - like all of our mattresses!

The trial allows you to test your mattress for 60 nights, and if you don't like it, you can swap it!

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 don't like the feel of your mattress after 30 nights, simply get in touch! We'll be happy to swap it for you.

Click here for more info about our 60-night comfort trial.

Specification

FirmnessExtra firm
Comfort fillingsReflex Foam
Support systemReflex Foam
Back careOrthopaedic support
Allergy careHypoallergenic
Single-sidedYes
Product careWashable cover, Removable cover
Guarantee3 years
Awards & accreditationsHandcrafted in the UK, Approved by the National Bed Federation
Fire resistanceConforms to BS7177: 2008, for use at home

Dimensions

SizeWidthLengthDepth
Single90cm190cm25cm
Small Double120cm190cm25cm
Double135cm190cm25cm
King Size150cm200cm25cm
Superking180cm200cm25cm

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

ÂŁ17.50

Delivery to the front door of your building

Free upgrade for 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 King Size and Superking

ÂŁ20.00

Mattress recycling

We'll take away your old mattress

ÂŁ35.00

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 31 reviews onTrustpilot logo

Product review stars

Customer Reviews Summary

summarised by AI

5 starsSteve
26 February 2026

Verified Purchase

3 starsSarah
4 February 2026

Verified Purchase

5 starsMargaret
2 February 2026

Verified Purchase

5 starsTeresa
14 January 2026

Verified Purchase

5 starsNaseer
31 December 2025

Verified Purchase

5 starsPatricia
11 December 2025

Verified Purchase

5 starsKelvin
5 December 2025

Verified Purchase

5 starsShun
3 December 2025

Verified Purchase

5 starsKevin
23 November 2025

Verified Purchase

2 starsNeha
12 November 2025

Verified Purchase

prev

1

Mattress Online Logo