Hypnos Legacy 3 Medium King Size Mattress
Hypnos

Hypnos Legacy 3 Medium King Size Mattress

The Hypnos Legacy 3 Medium is a pocket spring mattress with a medium feel, which means the springs move independently to follow the shape of your body rather than pushing back as one unit.

  • Medium feel suits most sleepers
  • Minimises partner disturbance
  • From a long-established British maker

£2,166.65

Size: King Size. Available at Mattress Man

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Where can I buy the Hypnos Legacy 3 Medium King Size Mattress?

Below are the best prices for the Hypnos Legacy 3 Medium Mattress in a King Size. Available from (9) trusted retailers.

Hypnos Legacy 3 Medium Mattress

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Prices last checked:
11th November 2026

Mattress dimensions for the Hypnos Legacy 3 Medium 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 Hypnos Legacy 3 Medium King Size Mattress

Mattress

Hypnos Legacy 3 Medium Mattress

Size

UK King (5ft x 6ft 6in)

Firmness

Medium

Construction

  • Pocket Spring

Depth (cm)

Layers

Layer Details

Key benefits

Key Benefits of the Hypnos Legacy 3 Medium King Size Mattress

  • 75cm each for couples: Two people sharing get 75cm of width apiece, which means you can both turn over without negotiating for space in the small hours.
  • Pocket springs plus space: Independently moving springs reduce motion transfer, and the UK king's width means a partner on a different schedule can slip out with less disruption.
  • Length for taller sleepers: The UK king is 10cm longer than the UK double, so a sleeper over six foot no longer wakes with their feet at the edge.
  • A step up you'll feel: It's 15cm wider than the UK double, a difference you notice every night rather than a figure on a spec sheet.
  • Room for the dog: If a dog claiming the foot of the bed is part of your routine, the extra width means it takes its share without pushing you both to the edges.

Who should buy the Hypnos Legacy 3 Medium King Size Mattress?

This size suits you if...

You share the bed every night and have outgrown a UK double, one of you keeps earlier hours than the other and you're tired of every exit waking you both, or one partner is approaching six foot and needs the 200cm length as much as the width.

Consider another size if...

Your bedroom is smaller than our suggested minimum of 2.7m x 2.9m, or you sleep alone and don't need the width. We'd recommend the UK double instead, which we suggest pairing with a room of at least 2.6m x 2.8m.

FAQ's

Frequently Asked Questions About the UK King

Is the Hypnos Legacy 3 Medium UK king big enough for a couple?

Yes, comfortably for most. The UK king gives each of you 75cm of width, and the pocket spring construction limits how much movement travels across the bed. If one of you is restless or works shifts, that combination of space and motion isolation is exactly what this size is for.

What room size do I need for a UK king Hypnos Legacy 3?

We suggest a room of at least 2.7m x 2.9m for a UK king. That allows walking space on both sides and room to make the bed. A new build master bedroom can feel tighter than the floor plan suggests once wardrobes go in, so measure the usable space, not the whole room.

Is the UK king Hypnos Legacy 3 long enough for someone over 6ft?

At 200cm long (5ft x 6ft 6in overall), the UK king gives a sleeper of six foot or a little over a genuine margin at the foot of the bed. It's 10cm longer than the UK double, and for taller sleepers that added length is often the real reason to upgrade.

Should I get the Hypnos Legacy 3 in a UK king or UK super king?

The UK super king is 30cm wider than the UK king, though the two are the same length, so it adds elbow room rather than legroom. It suits couples with a large bedroom: we suggest at least 3m x 2.9m for the UK super king, against 2.7m x 2.9m for the UK king.

Where can I buy the Hypnos Legacy 3 Medium in a UK king?

Availability shifts, so the most reliable answer is the live comparison table on this page, where prices are updated as retailers change them. Given that Hypnos publishes limited construction detail for this mattress, it's sensible to ask the retailer any material questions before ordering, whichever one you choose.