Relyon Chelsea 1500 Memory King Size Mattress
The Relyon Chelsea 1500 Memory Mattress is a medium firm hybrid, which means you get pocket springs for support with a layer of memory foam on top for that slow, cradling sink.
- Memory foam eases hips & shoulders
- Minimises partner disturbance
- Breathable cover lets heat escape
£559
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Relyon Chelsea 1500 Memory Mattress
More available sizes
Mattress details
Mattress
Relyon Chelsea 1500 Memory Mattress
Size
Firmness
Medium Firm
Construction
Foam
Pocket Spring
Hybrid
Memory Foam
Depth (cm)
27
Layers
3
Layer Details
Knitted Cover
A soft knitted cover that's breathable, which means heat can escape rather than building up. That helps keep you at a more even temperature through the night.
Memory Foam
Memory foam, originally developed by NASA, moulds to your body as it warms. You'll feel a gentle, contouring hug that supports your spine and eases pressure points.
1500 Pocket Springs
Each of the 1500 springs sits in its own fabric pocket, so they respond independently to your body. That means more targeted pressure relief and less disturbance from a partner's movement.
Layer details from mattressnextday.co.uk product page, September 2026.
Key benefits
- 75cm each for two sharing: Each of you gets 75cm of width, which means room to shift position without pressing into the memory foam right beside your partner.
- Movement stays on their side: The 1500 pocket springs respond independently, so if one of you gets up hours before the other, the motion mostly stops at their half of the 150cm width.
- 200cm of length for taller sleepers: At 6ft 6in long, this size adds 10cm over the UK double, which means anyone approaching six foot stops sleeping with their feet at the edge.
- Memory foam with space to use it: The contouring foam works best when you can settle into your own patch, and 75cm each gives side sleepers room to do exactly that.
- A breathable cover across a bigger surface: Memory foam holds warmth, so the knitted cover's breathability matters slightly more on a shared 150cm-wide mattress where two bodies add heat.
This size suits you if...
You share the bed every night and a UK double has started to feel cramped, especially with this mattress's cradling memory foam encouraging each of you to settle into your own spot. Or one of you is up at dawn while the other sleeps on, and you want the pocket springs and the extra width working together to keep that quiet. Taller sleepers wanting the 200cm length will also feel the difference.
Consider another size if...
Your bedroom is smaller than our suggested 2.7m x 2.9m minimum, or you sleep alone and the width would go unused. In either case we'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
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FAQ's
Is the Relyon Chelsea 1500 in a UK king big enough for a couple?
Yes, comfortably for most. Two people sharing get 75cm of width each, which is 7.5cm more per person than the UK double offers. Combined with the 1500 pocket springs that absorb movement independently, it's a sensible choice for couples who disturb each other, although very restless pairs may still prefer the UK super king.
Will the UK king Relyon Chelsea suit a tall sleeper?
It's one of the better sizes for height. At 200cm, or 6ft 6in, it runs 10cm longer than the UK single, small double and double, so someone approaching six foot gets clearance rather than heels hanging over the end. If you're taller still, the UK super king matches the same 200cm length while adding width.
What room size do I need for a UK king mattress like this?
We suggest a bedroom of at least 2.7m x 2.9m, with around 3.2m x 3.2m feeling genuinely comfortable once wardrobes and drawers are in. New build master bedrooms can be tighter than they first appear, so measure with your furniture in place before committing to the 150cm width.
Does the UK king reduce partner disturbance more than the double?
It helps in two ways. The 1500 pocket springs already limit motion transfer because each spring moves on its own, and the 150cm width, 15cm more than a UK double, puts extra distance between you. If one of you leaves for work hours before the other, that combination makes early alarms far less intrusive.
Should I choose the UK king or the UK super king in this mattress?
The UK king gives 75cm each for two sharing; the UK super king gives 90cm each, 15cm more per person, at the same 200cm length. If you share with a dog who claims a stripe of the bed, or one of you sprawls, the UK super king is tempting, but it needs a room of at least 3m x 2.9m.