Rest Assured Kelbrook Mattress
The Rest Assured Kelbrook is an extra firm pocket spring mattress built around 1400 pocket springs, which means each spring moves independently, so you get support that follows your shape rather than one solid push-back.
- Extra-firm for back & front sleepers
- Wool fillings help you stay cool
- Minimises partner disturbance
£475
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In the Rest Assured Kelbrook, wool fillings sit over the springs, a natural fibre that helps with temperature regulation through the night. It comes in five UK sizes, from Single up to Super King. Its extra firm feel is the main thing to weigh up: it suits people who want a genuinely solid surface, although lightweight sleepers and dedicated side sleepers may find it too unyielding for comfort.
Mattress specifications
Firmness
Extra Firm
Type
Pocket Spring
Depth (cm)
Number of Layers
2
Trial Period (nights)
60
Warranty (years)
Price Range
£475 to £734
Best Sleeping Position(s)
Stomach Sleeping
Certifications
Assessed from the specification published by Mattress Man, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
Choose the Kelbrook if you sleep on your back or front and want firm, traditional support without a soft top layer getting in the way. The 1400 pocket springs respond to each sleeper separately, which means less disturbance if you share the bed and your partner moves about. Wool fillings are a genuine plus at a mid-range starting price, breathing better than synthetic alternatives, so if you tend to run warm it should stay a little more temperate than foam-heavy rivals. It sits at a reasonable price for a pocket-sprung, wool-filled build. If you buy through Mattressman, they list a 60-night trial and free next day delivery, though those are the retailer's terms, not Rest Assured's.
Key features & layer details
Pocket springs
A core of 1400 pocket springs, each sewn into its own fabric pocket so it compresses independently. In practice this means support that adjusts to where you place weight, and less motion transferring across the bed.
Wool fillings
Wool fillings sit above the spring unit, softening the surface slightly without undermining the extra firm feel. Wool also wicks moisture and breathes well, which helps if you tend to overheat at night.
Layer details from mattressman.co.uk product page, September 2026.
Best suited for?
Back sleepers
The extra firm feel and thin wool layer give a solid, traditional surface, which means your body stays supported without a soft top layer getting in the way.
Front sleepers
Extra firm support with only a light wool layer above the springs keeps the surface flat and solid, so you are not sinking in.
Couples
The 1400 pocket springs each sit in their own fabric pocket, which means less movement carries across the bed when your partner shifts about.
Warm sleepers
Wool fillings breathe and wick moisture better than synthetic alternatives, which means the bed should stay a little more temperate if you tend to overheat at night.
This is an extra firm mattress, so it's not the one for side sleepers, who need more give at the shoulder and hip, or for lighter people who may simply sit on top of it rather than sink in. If you like a plush, cushioned surface, look elsewhere.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Rest Assured Kelbrook Mattress
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FAQ's
How firm is the Rest Assured Kelbrook mattress?
It's rated extra firm, the firmest end of the scale. That suits back and front sleepers who want a solid, supportive surface, but side sleepers and lighter people will likely find it too hard on pressure points like shoulders and hips.
How many springs does the Rest Assured Kelbrook have?
It has 1400 pocket springs. Each one sits in its own fabric pocket and moves independently, which means the mattress contours to your body and limits the motion you feel when a partner shifts position.
Does the Rest Assured Kelbrook come with a trial period?
Mattressman lists a 60-night trial on the Kelbrook. Bear in mind that's the retailer's own offer rather than a Rest Assured guarantee, so check the terms wherever you actually buy.
What sizes does the Rest Assured Kelbrook come in?
Five UK sizes: Single, Small Double, Double, King and Super King.
How much does the Rest Assured Kelbrook cost?
It depends on the size you choose, and the price table on this page shows the current price for each size. For a pocket-sprung mattress with natural wool fillings, it's a fair price, at the cost of a very firm feel that won't suit everyone.
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