Rankings Furniture & Soft Furnishings

Best king size mattresses

Shortlist and buying guide · the ranked board is on its way

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What to look for

Firmness is personal; check the trial period and whether it arrives rolled in a box.

Models worth comparing

From manufacturers' specifications and published UK reviews, read on 6 October 2026. Not tested by us. In no particular order: these are not ranked, and we do not say which is best until the customer ratings are in.

Budget

Silentnight Sleep Now Breathe

Warm sleepers wanting an affordable rolled pocket-sprung mattress from a long-standing UK brand.

  • 1,000 Mirapocket springs with a breathable fibre comfort layer
  • Edge-to-edge support for using the full width of the bed
  • Arrives rolled and boxed, which helps on narrow stairs

Watch out for: The 365-night comfort guarantee is described as an exchange, so check the terms if you want a refund option.

Type
Pocket sprung (1,000 Mirapocket springs)
Depth
24cm
Firmness
Medium/firm
Trial
365-night comfort guarantee (exchange)
Warranty
10 years

Check price on Amazon

Sources: Maker product page

Mid-range

Otty Original Hybrid

Couples who want a medium-firm hybrid with good motion isolation at a sensible price.

  • Up to 2,000 encapsulated pocket springs under memory and reflex foam
  • Reviewers noted good cooling and little partner disturbance
  • Available in sizes up to Emperor

Watch out for: Reviewers felt the corner support could be stronger, and the trial is a shorter 100 nights.

Type
Hybrid (pocket springs and foam)
Depth
25cm
Firmness
Medium-firm (7 out of 10)
Trial
100 nights
Warranty
10 years

Check price on Amazon

Sources: Maker product page · Expert Reviews: Otty Original Hybrid review

Premium

REM-Fit Natural Lux Hybrid

Back sleepers who want a firm, foam-free mattress made from wool and pocket springs.

  • 1,000 full-height pocket springs with three layers of Hampshire wool
  • No synthetic foam, with hand side-stitched edges
  • 200-night trial and 15-year guarantee

Watch out for: Too firm for lighter side sleepers, and reviewers noticed some motion transfer.

Type
Pocket sprung with natural wool
Depth
28cm
Firmness
Medium-firm (7 out of 10)
Trial
200 nights
Warranty
15 years

Check price on Amazon

Sources: Maker product page · Expert Reviews: REM-Fit Natural Lux Hybrid review

Pro

Simba Hybrid Ultra

Sleepers who want Simba's deepest, most layered hybrid with extra cooling features for a big bed.

  • Eleven layers with up to 7,300 Aerocoil springs, the most in Simba's range
  • HeatRelease cooling technology
  • Zip-off cover is machine washable

Watch out for: At 34cm it is very deep, so you may need deep fitted sheets, and it sits at the top of Simba's price range.

Type
Hybrid (Aerocoil springs and foam)
Depth
34cm
Firmness
Medium-firm
Trial
200 nights
Warranty
10 years

Check price on Amazon

Sources: Maker product page

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