Firmness
Type
Pocket Spring
Depth (cm)
Number of Layers
Trial Period (nights)
Warranty (years)
Price Range
£399 to £720
Best Sleeping Position(s)
Certifications
Assessed from Arthur Sleep's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
If you want a straightforward firm pocket spring mattress at a sensible price, the Ortho Arthur is worth a look. Starting at £399.00, 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 honest caveat: 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 & what's inside
Awaiting up to date specifications. Please check back later.
Who's it NOT for?
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.
Arthur Sleep Ortho Arthur Mattress
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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. Prices range from £399 to £720 depending on the size you choose, starting at £399.00 for the smallest option.
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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