Firmness
Medium Firm
Type
Pocket Spring
Depth (cm)
Number of Layers
Trial Period (nights)
60
Warranty (years)
Price Range
£429 to £639
Best Sleeping Position(s)
Certifications
Assessed from the specification published by Mattress Man, captured September 2026, and from regular price comparison across our UK retail partners.
Pocket springs suit most sleepers because each spring moves independently, which means less disturbance from a partner turning over and support that follows the shape of your body. The medium firm tension is a sensible middle ground: enough give for side sleepers of average build, enough resistance for back sleepers. At £429 to £639 it sits at the affordable end for a pocket sprung mattress, and the size range is broader than many, including EU sizes that can be hard to find. If you buy through Mattressman, their 60-night trial gives you time to judge it at home rather than in a shop for five minutes.
Key Features & what's inside
Awaiting up to date specifications. Please check back later.
Who's it NOT for?
If you prefer a soft, cradling feel, medium firm may feel a little unyielding, particularly for lightweight side sleepers. Spec-driven buyers should note that spring count, depth and guarantee details aren't published for this model, so you'll be buying somewhat on trust. Memory foam fans won't find that slow-sinking hug here.
Arthur Sleep King Arthur Mattress
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How firm is the Arthur Sleep King Arthur mattress?
It's a medium firm tension. In practice that means a supportive surface with some give, generally comfortable for back and combination sleepers. Lighter side sleepers may find it slightly too firm, while heavier sleepers often get on well with this level of support.
How much does the King Arthur mattress cost?
Prices range from £429 to £639 depending on the size you choose, starting at £429. That's an accessible price for a pocket spring mattress, though bear in mind detailed construction specs aren't published, so you can't verify spring counts before buying.
What sizes does the Arthur Sleep King Arthur come in?
It comes in eight sizes: UK Single, UK Small Double, UK Double, UK King and UK Super King, plus EU Single, EU Double and EU King. The EU options are useful if you have a continental bed frame, which many brands don't cater for.
Does the King Arthur mattress come with a trial?
Mattressman, the retailer listing this mattress, offers a 60-night trial. That's the retailer's own term rather than a manufacturer promise, so if you buy elsewhere, check that seller's returns policy. Sixty nights is enough time for your body to properly adjust to a new mattress.
How quickly is the King Arthur mattress delivered?
Mattressman lists free next day delivery, with a transit time of one to three days. As with the trial, this is the retailer's own offer, so delivery terms may differ if you find the mattress through another seller.
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