Komfi Vitality Ultra Firm King Size Mattress in a Box
Komfi

Komfi Vitality Ultra Firm King Size Mattress in a Box

The Komfi Vitality Ultra Firm Mattress in a Box is a single thick layer of high-density reflex foam, which means you get firm, even support from edge to edge with no softer top layer to sink into.

  • Very firm, flat sleeping surface
  • Edge-to-edge support
  • Removable cover, washable

£322.60

Size: King Size. Available at Archers Sleepcentre

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Where can I buy the Komfi Vitality Ultra Firm King Size Mattress in a Box?

Below are the best prices for the Komfi Vitality Ultra Firm Mattress in a Box in a King Size. Available from (9) trusted retailers.

Komfi Vitality Ultra Firm Mattress in a Box

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Prices last checked:
31st October 2026

Mattress dimensions for the Komfi Vitality Ultra Firm King Size Mattress in a Box

Length: 200cm

Width: 150cm

(5ft x 6ft 6in)

Minimum room size: 2.7m x 2.9m

Mattress details

Mattress Details for the Komfi Vitality Ultra Firm King Size Mattress in a Box

Mattress

Komfi Vitality Ultra Firm Mattress in a Box

Size

UK King (5ft x 6ft 6in)

Firmness

Extra Firm

Construction

  • Eco-Friendly

  • Foam

  • Rolled

Depth (cm)

20

Layers

Layer Details

Key benefits

Key Benefits of the Komfi Vitality Ultra Firm King Size Mattress in a Box

  • More room each than a UK double: You each get 75cm of width, which is 7.5cm more per person than a UK double and enough to stop elbows meeting in the night.
  • Extra length for tall sleepers: At 200cm long, the UK king is 10cm longer than a UK double, so a partner over six foot can stretch out without their heels hitting the edge.
  • Space between different schedules: If one of you is up hours before the other, the extra width gives a little more distance from the person getting up in the dark.
  • An even feel across the whole bed: Because it's a single layer of reflex foam, there's no softer side for one partner to roll towards, so both halves of the UK king feel the same.
  • Fits rooms a UK super king won't: We suggest at least 2.7m x 2.9m for a UK king, compared with 3m x 2.9m for the UK super king.

Who should buy the Komfi Vitality Ultra Firm King Size Mattress in a Box?

This size suits you if...

You share the bed every night with someone who also likes a very firm, flat surface, and a UK double now feels tight. It also fits if one of you is tall enough that length matters as much as width, and your bedroom comfortably clears 2.7m x 2.9m.

Consider another size if...

Your bedroom is under our suggested 2.7m x 2.9m once the wardrobes are 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

What are the dimensions of the Komfi Vitality Ultra Firm UK king?

The UK king measures 150 x 200cm, or 5ft x 6ft 6in, and the mattress is 20cm deep. That makes it 15cm wider and 10cm longer than the UK double version of the same mattress.

Is the UK king Komfi Vitality Ultra Firm long enough for someone over 6ft?

It's 200cm long, which is 10cm more than the UK double and the same length as the UK super king. If height is your main reason for upgrading, the UK king gives you that extra length without needing the wider room a UK super king asks for.

How much space does each person get on a Komfi Vitality Ultra Firm king size?

Two people sharing get 75cm each. That's 7.5cm more per person than the UK double, but 15cm less each than the UK super king, which gives 90cm each.

What size bedroom do I need for a UK king Komfi Vitality Ultra Firm?

We suggest at least 2.7m x 2.9m, with 3.2m x 3.2m giving more comfortable space to walk around. New build master bedrooms can feel smaller than their floor plan once fitted wardrobes go in, so measure with furniture in place.

Should I get the Komfi Vitality Ultra Firm in a UK king or UK super king?

The UK king is 30cm narrower than the UK super king and the same length. Choose the UK super king if you want 90cm each and your room clears 3m x 2.9m; the UK king suits rooms from 2.7m x 2.9m.