Komfi Serenity Comfort Reflex Double Mattress in a Box
Komfi

Komfi Serenity Comfort Reflex Double Mattress in a Box

The Komfi Serenity Comfort Reflex Mattress in a Box has a firm reflex foam build with a recycled foam base, which means you get steady, supportive sleep in a mattress that arrives rolled up.

  • Firm feel for back sleepers
  • Recycled foam in the build
  • Washable cover & no flipping

£245.02

Size: Double. Available at Archers Sleepcentre

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Where can I buy the Komfi Serenity Comfort Reflex Double Mattress in a Box?

Below are the best prices for the Komfi Serenity Comfort Reflex Mattress in a Box in a Double. Available from (9) trusted retailers.

Komfi Serenity Comfort Reflex Mattress in a Box

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Prices last checked:
1st November 2026

Mattress dimensions for the Komfi Serenity Comfort Reflex Double Mattress in a Box

Length: 190cm

Width: 135cm

(4ft 6in x 6ft 3in)

Minimum room size: 2.6m x 2.8m

Mattress details

Mattress Details for the Komfi Serenity Comfort Reflex Double Mattress in a Box

Mattress

Komfi Serenity Comfort Reflex Mattress in a Box

Size

UK Double (4ft 6in x 6ft 3in)

Firmness

Firm

Construction

  • Eco-Friendly

  • Foam

  • Rolled

Depth (cm)

20

Layers

Layer Details

Key benefits

Key Benefits of the Komfi Serenity Comfort Reflex Double Mattress in a Box

  • Room for two settled sleepers: Each of you gets 67.5cm of width, which suits couples who lie fairly still, although restless partners may notice each other more than they would on a UK king.
  • Fits ordinary bedrooms: We suggest a room of at least 2.6m x 2.8m, so the UK double suits many second bedrooms and first flats where a UK king would crowd the furniture.
  • Firm support on both sides: The firm foam surface means two back sleepers both feel held up across the full 135cm width, with no springs inside the mattress.
  • Easy to dress: Double sheets and duvets are widely sold in every kind of shop, which helps if you're kitting out a whole home and the money is already spread thin.
  • Sensible for a guest room: In a spare room it gives visiting couples a proper shared bed, and the zipped, machine-washable cover makes freshening it up between visitors a little simpler.

Who should buy the Komfi Serenity Comfort Reflex Double Mattress in a Box?

This size suits you if...

You share a bed most nights in a bedroom of typical UK size and you both prefer a firm surface, or you're setting up a guest room for visiting couples and want a proper shared bed without filling the floor.

Consider another size if...

One of you sprawls, or 67.5cm each already feels tight. If your room allows at least 2.7m x 2.9m, we'd recommend the UK king instead.

FAQ's

Frequently Asked Questions About the UK Double

Is the Komfi Serenity Comfort Reflex double big enough for two people?

It gives 67.5cm each, which suits most couples who sleep fairly still. If one of you spreads out or you're both broad across the shoulders, the UK king adds 7.5cm each and is 10cm longer, which taller sleepers may also appreciate.

What room size do I need for the Komfi Serenity Comfort Reflex in a UK double?

We suggest at least 2.6m x 2.8m, with around 3m x 3m feeling comfortable once furniture goes in. If you want bedside tables on both sides, measure for a clear walkway around the bed before you buy.

Komfi Serenity Comfort Reflex double vs king: which should I choose?

The UK double is 15cm narrower and 10cm shorter than the UK king. Choose the UK double if your room is on the snug side. We suggest at least 2.7m x 2.9m for the UK king, so only size up if that space is really there.

What are the Komfi Serenity Comfort Reflex double dimensions in feet?

It measures 4ft 6in x 6ft 3in, which is 135 x 190cm. The mattress is 20cm deep, so check the pocket depth on any double fitted sheet you already own before relying on it.

Is a UK double Komfi Serenity Comfort Reflex too much for one sleeper?

Not if your room allows it. A solo sleeper gets the full 135cm, which is 45cm wider than the UK single, handy if a pet likes to stretch out at your feet. In a box room, we suggest at least 2.1m x 2.8m for the UK single.