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Sealy Activsleep Ortho Extra Firm Mattress Rated 4/5 based on 41 customer reviews

Sealy Activsleep Ortho Extra Firm Mattress

Brand: Sealy


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What Makes The Sealy Activsleep Ortho Extra Firm Mattress Great?

It looks good and its well made. Its comfi and gives quite nice back support ( but only in case nobody is moving or changing sleeping position).Generally I sleep better than on the old mattress.


This product is unlikely to cause any sort of allergic reaction. Ideal if you suffer from any sort of allergy problems

Made in the UK

These are made and manufactured in the UK, meaning that they all meet the same exceptional quality and durability that we expect from genuine UK manufacturing.

5 year guarantee

A 5 year guarantee is quite rare in the industry and is a great indicator of the retailer beleiving in their product. Anything go wrong in the next 5 years, no drama, get it replaced.

Handcrafted in the UK

Handcrafted in the UK means that the product is built here, by people being paid a fair and honest wage using certified and safe products of good quality and construction. UK manufacturing is some of th best in the world and all of that is reflected in this product

Orthopaedic Support

Do you suffer from back pain? If so you will likely find that an orthopaedic mattress will be massively beneficial to you. Slightly firmer in the comfort side of things but ultimately with a better support layer means that your back and neck will thank you for years to come.

Knitted Cover

It is common in the industry to have a knitted cover, these covers can come in a variety of patterns but are typically hard wearing and do not present problems for consumers.

Part of Sealy's Activsleep collection, designed to help you wake refreshed

Extra-firm - perfect if you love a sturdy feel

Plenty of orthopaedic support to care for your back

Sealy's PostureTech Zero Deflection spring system provides high levels of support

Zero Deflection helps prevent the transfer of motion between you and your partner

Expertly hand-tufted to lock in and secure the fillings firmly

Hand-tufting also provides enhanced support

Smooth knitted fabric cover is plush and cushioning

Adaptive cover technology helps wick away moisture for a cooler, fresher sleep

Cover is infused with Purotex probiotics to guard against dust mites and bacteria

Approved by Allergy UK for your peace of mind

Hypoallergenic - a good choice if you suffer from allergies

No need to turn - easy-care and single-sided

Simply rotate end-to-end on a regular basis

PostureTech Zero Deflection

Soft white fibres

White fibres tend to be a mixture of polester and other non-descript synthetic fibres

Extra firm

Extra Firm mattresses are great for those that have a heavier BMI than average, or, for those of average of higher BMI that suffer from back pain. If you find yourself sleeping on your side, or you are of a lower BMI, you may want to consider a lower firmness mattress as this will likely not be suitable.


Single sided means only one side is comfy. Positives are you only need to rotate the mattress occassionaly rather than the more cumbersome rotate and flip. Downside is the lifespan of the product may suffer as a result, only marginal, but worth mentioning.

Approved by the National Bed Federation

The NBF is one of the most prestigious awarding federations in the industry, helped slightly by the fact that it is one of the only, however, it is still a great source of comfort knowing that this product holds approval by the team

Approved by Allergy UK

If you have allergies then you may want to consider a mattress like this. Approved by Allergy UK, this product has fillings that are approved for those that suffer from a host of common allergies and while there is no guarantee that this product will prevent allergies, it should prevent further problems for those that do suffer

Fire Resistant

Fire resistant does not mean the product will never catch fire, rather, it will not go up in flames quite so quickly. Resistant to fire in the same way that I am resistant to kisses, sooner or later you end up giving in.

Depth: 23cm

23CM of mattress height is about standard for a good quality product. While the height of a mattress does not necessarily correlate to the quality, it does become harder to get good quality materials and fillings into a smaller frame. To that end, a mattress of 23cm is a good sign that the mattress may be a quality product. For this size of mattress you should just about be able to use normal fitted sheets without issue.

23cm deep

23cm Or 9 inches is slightly larger than the industry standard 7 inches. Most offer a range between 10 to 14 inches and the higher the load, the deeper it needs to be. 9 Inches sits comfortably in the lower-middle weight range. 

Customer Reviews For The Sealy Activsleep Ortho Extra Firm Mattress

Based on 41 review

We prefer a kinda firm mattress and this is perfect for us not too firm...we dont roll together plus when we move it doesnt affect the movement of the mattress


This is the most comfortable mattress I have ever slept on, wish I had bought one ages ago. Its firm but not rock hard which is perfect for me. Brilliant!!


Great nights sleep straight out of the bag. I was expecting a few nights to break in but neednt have worried.


Quality mattress that gives full body support and is extremely comfortable giving an excellent nights sleep.


I selected this mattress because it does not need to be turned over. Rotating it is easy.


This matteres is the best IV slept on not too firm but enough to support its excellent


3rd mattress from mattressonline over the years.Quite happy and great value.


Firm and comfortable, we bought like for like. Same mattress as before.


Waking up in the morning with no aches and feeling refreshed.


Nice and firmLooks goodHandles are useful for lifting


Seems well made and a recognised brand for the price.


love this mattress very comfortable would recommend.


Firmness. What I wanted was a good firm mattress.


Superb co fort, support and depth of mattress.


Soft to firm ratings from 1 to 6 on website.


It is extremely comfortable supportive.


Well support for back and no roll over.


you do not need to turn the Mattress


Very comfortable and great quality


Firm edge as well as firm design


The mattress has great support


Well made and very comfortable


Good support on the body .


Offers wonderful support.


Firm yet very comfortable


Very attractive mattress.


Firm and comfortable


Firm but comfortable


Its very firm



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