Relyon Ultra Cool Gel 2400 King Size Mattress
Relyon

Relyon Ultra Cool Gel 2400 King Size Mattress

The Relyon Ultra Cool Gel 2400 is a hybrid mattress, which means it combines springs with comfort layers rather than relying on foam alone.

  • Suits sleepers who run warm
  • Medium-firm feel, easy to move on
  • From a long-established British maker

£1,287.75

Size: King Size. Available at Mattress Man

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Where can I buy the Relyon Ultra Cool Gel 2400 King Size Mattress?

Below are the best prices for the Relyon Ultra Cool Gel 2400 Mattress in a King Size. Available from (9) trusted retailers.

Relyon Ultra Cool Gel 2400 Mattress

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Prices last checked:
11th November 2026

Mattress dimensions for the Relyon Ultra Cool Gel 2400 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 Relyon Ultra Cool Gel 2400 King Size Mattress

Mattress

Relyon Ultra Cool Gel 2400 Mattress

Size

UK King (5ft x 6ft 6in)

Firmness

Medium Firm

Construction

  • Pocket Spring

  • Hybrid

  • Gel

Depth (cm)

Layers

Layer Details

Key benefits

Key Benefits of the Relyon Ultra Cool Gel 2400 King Size Mattress

  • More room each than a double: You each get 7.5cm more width than on a UK double, which means fewer elbows and less waking when your partner turns over.
  • Length for taller partners: At 200cm long, the UK king is 10cm longer than a UK double, so a partner over six foot is less likely to have their feet hanging off the end.
  • Easier on staggered schedules: If one of you gets up hours before the other, the extra width means the early riser can slip out with less jostling of whoever is still asleep.
  • A firm edge to push off from: The medium firm hybrid surface gives you something stable to press against, which helps if getting in and out of bed has become slow after an injury or operation.
  • Space without super king demands: We suggest at least 2.7m x 2.9m for the UK king, compared with 3m x 2.9m for the UK super king, so it fits more ordinary master bedrooms.

Who should buy the Relyon Ultra Cool Gel 2400 King Size Mattress?

This size suits you if...

You share the bed every night and have outgrown a UK double, or one of you is tall enough that length matters as much as width. It also suits you if you and your partner keep different hours and want the early riser to disturb the other a little less.

Consider another size if...

You want lots of spread-out space, or your dog routinely takes a share of the bed. We'd recommend the UK super king instead, which needs at least 3m x 2.9m.

FAQ's

Frequently Asked Questions About the UK King

Is the Relyon Ultra Cool Gel 2400 UK king big enough for two people?

For most couples, yes. The UK king gives 75cm each for two sharing, which is 7.5cm more each than the UK double. If you both sprawl, or a pet regularly joins you, the UK super king gives 90cm each and may suit you better.

How big is the Relyon Ultra Cool Gel 2400 UK king in feet?

The UK king measures 5ft x 6ft 6in, which is 150 x 200cm. It is the same length as the UK super king but 30cm narrower.

What size bedroom do I need for a Relyon Ultra Cool Gel 2400 king?

We suggest allowing at least 2.7m x 2.9m, with 3.2m x 3.2m comfortable. New build master bedrooms can feel smaller than their floor plans once fitted wardrobes are in, so measure the clear floor space, not the whole room.

Should a tall sleeper choose the Relyon Ultra Cool Gel 2400 in king or super king?

If length is your only concern, either works, because the UK king and the UK super king are both 200cm long. Choose the UK super king only if you also want more width, as it is 30cm wider and needs at least 3m x 2.9m.

Is it worth upgrading from a double to a Relyon Ultra Cool Gel 2400 king during pregnancy?

It can help. The UK king is 15cm wider and 10cm longer than a UK double, which gives room for support pillows and changing position without pushing your partner towards the edge. The medium firm surface may feel a little solid on the hips for some side sleepers.