Firmness
Medium
Type
Pocket Spring
Depth (cm)
26
Number of Layers
4
Trial Period (nights)
100
Warranty (years)
10
Price Range
£989 to £1,574
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.
The appeal here is natural comfort over synthetic foam. The wool and alpaca fillings breathe well, which means you're less likely to overheat than on a memory foam top, a genuine plus if you're a warm sleeper. Two tiers of springs, mini pockets over standard pockets, respond independently to each part of your body, so a heavier hip and a lighter shoulder each get their own level of give. Yes, from £989.00 it sits at the pricier end, but the handcrafted UK build and 10-year guarantee listed by the retailer go some way to justifying it. Mattress Online lists a 100-night trial, although that's the retailer's offer and requires buying a mattress protector from them.
Key Features & what's inside
- Cover. A soft, woven viscose cover sits on top. Viscose is smooth and breathable, so the surface feels gentle against bedding rather than clammy.
- Comfort fillings. Beneath the cover sit generous natural fillings of British wool and alpaca wool. Wool helps regulate temperature, which means it can feel warmer in winter and cooler in summer than synthetic fillings.
- Mini Pocket Springs. A layer of small, individually cased springs adds comfort close to the surface. These respond to lighter pressure, giving soothing relief at the shoulders and hips.
- Pocket Springs. The main support comes from individual springs encased in cloth pockets. Each one adapts to movement separately, so support is distributed to each part of your body rather than the whole bed tilting when your partner turns over.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
If you prefer a plush, cradling surface, a medium with a sprung feel may seem slightly firm, and one lighter-weight reviewer found exactly that. Fans of the slow, contouring hug of memory foam won't get it here. And if your budget sits well under £989.00, better-suited options exist elsewhere.
Sleepeezee Centurial 01 4500 Pocket Mattress
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How firm is the Sleepeezee Centurial 01 4500?
It's rated medium, which suits most back and combination sleepers. Firmness is felt differently depending on your weight: one lighter reviewer found it firmer than expected, and another review reported receiving a firm feel despite ordering a medium, a discrepancy that hasn't been resolved. If you're unsure, check the trial terms before you buy.
Does the Sleepeezee Centurial 01 4500 come with a trial?
Mattress Online lists a 100-night trial, but this is the retailer's own offer rather than a Sleepeezee guarantee, and it requires buying a mattress protector from MattressOnline. If you purchase elsewhere, check that retailer's returns policy, as the same trial won't automatically apply.
What is the Sleepeezee Centurial 01 4500 made of?
It combines natural fillings of British wool and alpaca wool with two layers of springs: mini pocket springs for surface comfort and full pocket springs for support. A woven viscose cover finishes it off. The mattress is 26cm deep and handcrafted in the UK.
What sizes does the Sleepeezee Centurial 01 4500 come in?
It's available in UK Single, Small Double, Double, King and Super King, priced from £989.00 to £1,574 depending on the size you choose.
Is there a guarantee on the Sleepeezee Centurial 01 4500?
Mattress Online lists a 10-year guarantee on this mattress. As that figure comes from a retailer listing rather than Sleepeezee's own page, it's sensible to confirm the guarantee terms with whichever retailer you buy from.
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