Firmness
Firm
Type
Hybrid
Depth (cm)
31
Number of Layers
3
Trial Period (nights)
100
Warranty (years)
8
Price Range
£885
Best Sleeping Position(s)
Certifications
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Choose this mattress if you want firm support without the dead, flat feel of an all-foam bed. The 1,000 Posturepocket springs work with 800 mini pocket springs underneath, which means the surface responds to your individual shape rather than pushing back uniformly. Above that, the Respire memory foam layer eases pressure on aching joints, so the firmness shouldn't feel harsh at contact points. The cover is knitted and includes a Bio-Protect probiotic treatment. The owner rating is middling, and it's only listed in UK King, but if a firm hybrid from an established British maker is what you're after, this fits the brief.
Key Features & what's inside
- Respire Memory Foam. A 4.5cm layer of Respire memory foam sits at the top, which means pressure relief for aching joints before you reach the firmer springs below. It softens the initial feel of an otherwise firm mattress.
- Posturepocket Springs. 1,000 Posturepocket springs provide the main support layer. Because each spring moves independently, your body is supported along its full length rather than sagging into one spot.
- Mini Pocket Springs. A base of 800 mini pocket springs responds to your individual body shape and movements. This second spring layer adds a more precise, adaptive quality than a single spring unit would give.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
This is a firm mattress, so lightweight side sleepers are likely to find it too hard for comfortable pressure relief at the shoulder and hip. It's also currently listed in UK King only, and at £885 it's a poor fit for anyone shopping to a tighter budget or wanting a softer, more cradling feel.
Relyon Memory Plus 1800 Pocket Mattress
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How firm is the Relyon Memory Plus 1800 Pocket mattress?
It's rated firm. The 4.5cm memory foam top layer takes a little edge off the initial feel, but this is a supportive, firmer bed overall. It suits back and front sleepers and those who prefer a solid surface, rather than anyone wanting a soft, sinking feel.
How many springs does the Relyon Memory Plus 1800 have?
1,800 in total: 1,000 Posturepocket springs providing the main support, plus a layer of 800 mini pocket springs beneath that responds to your body shape and movement. Each spring moves independently, which helps reduce the ripple effect when a partner shifts in the night.
Does the Relyon Memory Plus 1800 come with a trial?
Mattress Online lists a 100-night trial with this mattress, though the trial requires you to buy a mattress protector from them. That trial is the retailer's own offer rather than a Relyon policy, so if you buy elsewhere the terms may differ. Check before you order.
What guarantee does the Relyon Memory Plus 1800 have?
The Mattress Online listing shows an 8-year guarantee. As this appears on a retailer listing rather than Relyon's own site, confirm the guarantee terms with whichever retailer you buy from.
How deep is the Relyon Memory Plus 1800 mattress?
It's 31cm deep, which is a substantial build. It's a hybrid of memory foam over two pocket spring layers, so check your fitted sheets are deep enough, as standard sheets can struggle with mattresses of this depth.
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