Relyon Chelsea 1500 Memory Mattress
Mattress
Relyon Chelsea 1500 Memory Mattress
Size
Firmness
Medium Firm
Construction
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.
- 90cm each for two sharing: Each sleeper gets 90cm of width, which means you can spread out fully without meeting in the middle.
- Pocket springs matter more at this width: The 1500 pocket springs respond independently, and combined with the physical distance a super king offers, a restless partner becomes genuinely easy to sleep through.
- Room for the whole household: When children wander in during the night or a large dog treats the bed as theirs, 180cm of width means adults still get a proper share.
- 15cm more each than a UK king: The UK super king is 30cm wider than the UK king at the same length, giving each sharer 15cm more space.
- Memory foam comfort at scale: The memory foam layer moulds to each sleeper separately across the full 6ft x 6ft 6in surface, easing pressure on hips and shoulders wherever you settle.
This size suits you if...
You share the bed every night and want the most space UK retailers stock as standard, you sleep with a genuinely restless partner and have learned that distance solves what no comfort layer can, or your household routinely includes children or pets in the bed and a UK king has started to feel crowded.
Consider another size if...
Your bedroom is smaller than our suggested minimum of 3m x 2.9m, or you sleep alone. We'd recommend the UK king instead, which still gives couples 75cm each and needs a room of at least 2.7m x 2.9m.
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Is a super king too big for my bedroom?
It depends on the room. We suggest at least 3m x 2.9m for a UK super king, with around 3.5m x 3.2m feeling comfortable once you add bedside tables and walking space. In a period property or a large master bedroom a UK king can look undersized, and the super king fills the space properly.
Is the Relyon Chelsea 1500 super king good for couples?
Yes, and it's arguably the size where this mattress makes most sense. You get 90cm each for two people sharing, and the 1500 pocket springs move independently, so between the width and the spring design a partner turning over is unlikely to wake you.
How much bigger is a super king than a king?
The UK super king is 30cm wider than the UK king, and both are the same length. For two people sharing, the UK king gives 75cm each while the UK super king gives 15cm more each. That extra width is what makes room for a child or pet without squeezing the adults.
Where can I buy the Relyon Chelsea 1500 in a super king?
Availability changes, so the most reliable answer is the live comparison on this page. The prices shown here are updated as retailers change them, so compare the retailers listed above rather than relying on a figure quoted elsewhere.
Will the memory foam feel different in a super king?
The construction is identical across sizes: the same medium firm feel, memory foam layer and 1500 pocket springs. What changes is how you use it. With 90cm each, two sleepers sink into their own patch of foam without rolling towards each other, which suits couples with different sleeping positions.