Firmness
Medium Firm
Type
Hybrid
Depth (cm)
27
Number of Layers
3
Trial Period (nights)
Warranty (years)
10
Price Range
£389 to £629
Best Sleeping Position(s)
Certifications
Assessed from the specification published by MattressNextDay, captured September 2026, and from regular price comparison across our UK retail partners.
The main draw is the combination of 1500 pocket springs and memory foam. The springs move independently of each other, which means less motion transfer if you share a bed, while the foam moulds to your shape and eases pressure on hips and shoulders. The knitted cover is breathable, which helps with temperature through the night. It's backed by a Relyon 10-year guarantee, as stated on the MattressNextDay listing, and meets the BS7177: 2008 low hazard fire safety standard. At £389 to £629 it sits at a reasonable price for a branded hybrid with this spring count, with only one retailer currently stocking it in our comparison.
Key Features & what's inside
- 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.
Who's it NOT for?
If you love a plush, deep-sink feel, this medium firm hybrid will probably feel firmer than you'd like, and some owners report it's firmer than expected. Hot sleepers who react badly to memory foam's warmth may also want to look at a foam-free option, despite the breathable cover.
Relyon Chelsea 1500 Memory Mattress
Across 54 verified reviews on MattressNextDay, the Chelsea 1500 scores 4.9 out of 5, with owners praising its comfort, support and luxurious feel. A few find it firmer than expected, though those wanting solid spinal support see that as a plus.
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How firm is the Relyon Chelsea 1500 mattress?
It's rated medium firm. In practice that means a supportive base from the 1500 pocket springs with a softer surface feel from the memory foam layer. Some owners report it feels a little firmer than expected, which suits back sleepers and those wanting solid spinal support.
Does the Relyon Chelsea 1500 come with a guarantee?
Yes. The MattressNextDay listing states a Relyon 10-year guarantee. No sleep trial is mentioned on that page, so check returns terms with your retailer before you buy if being able to send it back matters to you.
How deep is the Relyon Chelsea 1500 mattress?
It's 27cm deep, which should work with most standard fitted sheets. Inside that depth you get a breathable knitted cover, a memory foam comfort layer and 1500 pocket springs.
Is the Relyon Chelsea 1500 good for allergy sufferers?
It's certified hypoallergenic, and it's also vegan friendly, so there are no animal-derived fillings. Relyon is an NBF-approved manufacturer, and the mattress meets the BS7177: 2008 low hazard fire safety standard.
What sizes does the Relyon Chelsea 1500 come in?
It's available in UK Single, Double, King and Super King, priced from £389 to £629 depending on the size you choose.
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