Arthur Sleep Ortho Arthur Mattress
The Ortho Arthur from Arthur Sleep is a pocket spring mattress designed for firm support and restorative sleep, which means individual springs respond to your body rather than the whole surface moving as one.
- Firm support for back & front sleepers
- Cooling gel foam comfort layer
- Hypoallergenic & anti-allergy cover
£415
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The Ortho Arthur comes in UK Single, Double, King and Super King. Its firmer feel tends to suit back and front sleepers, although lightweight side sleepers may find it a little too solid at the shoulder and hip. Arthur Sleep publishes very little detail about what sits inside this mattress, so if you like to compare spring counts and foam layers before buying, you will find the spec sheet frustratingly thin here.
Mattress specifications
Firmness
Firm
Type
Pocket Spring
Depth (cm)
Number of Layers
2
Trial Period (nights)
Warranty (years)
Price Range
£415 to £756
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Certifications
Assessed from Arthur Sleep's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
If you want a straightforward firm pocket spring mattress at a sensible price, the Ortho Arthur is worth a look. It sits at the more affordable end of the pocket sprung market, and the firm support Arthur Sleep describes is the kind of feel many people with a heavier build, or a preference for sleeping on their back, actively look for. The downside: the brand shares no construction details, no stated trial period and no published guarantee, so you are buying with less information than most rivals give you. If that trade-off between price and transparency sits comfortably with you, it may still be a reasonable pick.
Key features & layer details
Gel foam comfort layer
A gel foam layer sits at the top and forms the comfort layer. It adds a little cushioning over the firm springs below, and the gel is there to help control temperature.
Pocket spring core
The core is made of pocket springs, each housed in its own fabric pocket. That lets the springs move independently, so you get firm support that responds to your body rather than moving as one sheet.
Layer details from arthursleep.co.uk and mattressman.co.uk product pages, October 2026.
Best suited for?
Back sleepers
The firmer feel described by Arthur Sleep gives a flatter, more supportive surface, which suits anyone who spends the night lying on their back.
Front sleepers
Firm support from the pocket springs helps keep your hips from sinking too far, which is what many people who sleep on their front look for.
Heavier sleepers
The firm pocket spring feel is the kind many people with a heavier build actively look for, as it resists sinking in.
Budget buyers
Sitting at the more affordable end of the pocket sprung market, it gives you a straightforward firm mattress without paying for extra features.
If you sleep on your side and are on the lighter side, a mattress designed for firm support may press uncomfortably at the shoulder and hip. It is also not the one for detail-driven buyers: with no published spring count, materials list or guarantee, you cannot compare it spec-for-spec against other mattresses.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Arthur Sleep Ortho Arthur Mattress
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FAQ's
How firm is the Arthur Sleep Ortho Arthur mattress?
Arthur Sleep describes it as designed for firm support and restorative sleep. That generally suits back and front sleepers, and anyone who finds softer mattresses let them sink too far. Lightweight side sleepers may find it a little too firm for comfortable pressure relief.
What sizes does the Ortho Arthur mattress come in?
It is available in four UK sizes: Single, Double, King and Super King.
Is the Ortho Arthur a pocket spring mattress?
Yes, it uses pocket springs, which means each spring is sewn into its own fabric pocket and moves independently. In practice, that gives more targeted support and less motion transfer than an open coil mattress. Arthur Sleep does not publish a spring count, so the exact number is not known.
Does the Arthur Sleep Ortho Arthur come with a trial or guarantee?
Arthur Sleep's product page does not state a trial period, guarantee or delivery terms for this mattress. If those matter to you, and for most buyers they should, contact the retailer directly and get any terms in writing before you order.
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