Silentnight Essentials Miracoil Ortho King Size Mattress
Silentnight

Silentnight Essentials Miracoil Ortho King Size Mattress

The Silentnight Essentials Miracoil Ortho Mattress uses a miracoil continuous spring system with head-to-toe rows, which means you and a partner are less likely to roll together in the middle of the night.

  • Firm, flat surface for back sleepers
  • Less partner disturbance & roll-together
  • 60-night trial

£339

Size: King Size. Available at Silentnight

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Where can I buy the Silentnight Essentials Miracoil Ortho King Size Mattress?

Below are the best prices for the Silentnight Essentials Miracoil Ortho Mattress in a King Size. Available from (9) trusted retailers.

Silentnight Essentials Miracoil Ortho Mattress

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Prices last checked:
1st November 2026

Mattress dimensions for the Silentnight Essentials Miracoil Ortho King Size Mattress

Length: 200cm

Width: 150cm

(5ft x 6ft 6in)

Minimum room size: 2.7m x 2.9m

Mattress details

Mattress Details for the Silentnight Essentials Miracoil Ortho King Size Mattress

Mattress

Silentnight Essentials Miracoil Ortho Mattress

Size

UK King (5ft x 6ft 6in)

Firmness

Firm

Construction

  • Open Coil Spring

  • Orthopaedic

Depth (cm)

22

Layers

Layer Details

Key benefits

Key Benefits of the Silentnight Essentials Miracoil Ortho King Size Mattress

  • More space for each of you: At 75cm per sleeper, you each get 7.5cm more than on a UK double, which means fewer knocked elbows when one of you turns over in the night.
  • Length for a taller partner: The UK king is 10cm longer than a UK double, so someone over six foot can lie straight without their feet resting on the edge.
  • Fewer disturbances on different schedules: Silentnight says the head-to-toe spring rows prevent roll-together, so a partner leaving hours early should cause less upheaval, helped by the extra gap between you.
  • A firm surface for two back sleepers: The firm 22cm open coil build gives you both a flat surface to lie on, although side sleepers wanting cushioning at the shoulders may find it unforgiving.
  • Check the room before you order: We suggest at least 2.7m x 2.9m, with 3.2m x 3.2m comfortable, so measure a new build master bedroom after the wardrobes go in.

Who should buy the Silentnight Essentials Miracoil Ortho King Size Mattress?

This size suits you if...

You share the bed every night and feel cramped on a UK double, or one of you is over six foot and keeps running out of room at the foot end. It also suits couples on different schedules who want a firm, steady surface with a little more distance between them.

Consider another size if...

Your bedroom measures less than 2.7m x 2.9m once the furniture is in. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m.

FAQ's

Frequently Asked Questions About the UK King

Is the Silentnight Miracoil Ortho UK king big enough for two adults?

Yes, for most couples. The UK king gives you 75cm each, against 67.5cm each on the UK double. That 7.5cm sounds small, but you notice it when one of you shifts position or sleeps with an arm out. If you both sprawl, you may still want more width than the UK king offers.

Is a UK king Miracoil Ortho long enough if I'm over 6ft?

The UK king is 200cm long (6ft 6in), which is 10cm longer than a UK double. For a partner over six foot, the extra length often matters more than the extra width, because it stops your feet pressing against the end of the bed or a footboard.

What size bedroom do I need for a UK king mattress?

We suggest at least 2.7m x 2.9m for a UK king, with 3.2m x 3.2m giving comfortable space to walk round. New build master bedrooms can look generous when empty, then shrink once fitted wardrobes and bedside tables go in, so measure the finished room rather than the floor plan.

Should I get the Miracoil Ortho in a UK king or UK super king?

The UK super king gives 90cm each, which is 15cm more each than the UK king, at the same length. It needs more floor space, though: we suggest at least 3m x 2.9m. If a dog regularly takes a corner of the bed, the extra width helps. Otherwise the UK king suits most couples.

What bedding fits a Silentnight Miracoil Ortho king size?

Standard UK king fitted sheets fit the 150 x 200cm mattress, and a 230 x 220cm king duvet covers it. The mattress is 22cm deep, so check that the fitted sheet's pocket depth is enough to hold the corners in place.