Wentworth Mercer Premium Naturals 8000 Pocket Mattress
The Wentworth Mercer Premium Naturals 8000 Pocket Mattress is a firm pocket spring mattress, handcrafted in the UK.
- Mini springs add a forgiving surface
- Wool, cotton & silk for warm sleepers
- Sturdy edges for full-width use
£949
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At 32cm deep, the Wentworth Mercer Premium Naturals 8000 has 8000 springs in total: 1000 full-size pocket springs for support and 7000 mini pocket springs layered above for comfort. The fillings are natural, including wool, cotton and silk, which means the mattress breathes well and feels softer at the surface than the firm support underneath might suggest. It's available in five UK sizes from Single to Super King. It's stocked through MattressOnline, which lists a 100-night trial and an 8 year guarantee with the mattress.
Mattress specifications
Firmness
Medium Firm
Type
Pocket Spring
Depth (cm)
32
Number of Layers
3
Trial Period (nights)
100
Warranty (years)
8
Price Range
£949 to £1,799
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Combination Sleeping
Certifications
BS 7177
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
This mattress suits you if you want firm support with a natural, breathable feel rather than foam. The 1000 individually pocketed springs react independently to your body shape, which means less motion transfer if you share a bed, while the 7000 mini pocket springs add a slightly more forgiving surface layer. Wool, cotton and silk fillings help regulate temperature, a genuine plus if you sleep warm. Butterfly springs and a rod frame around the border give a sturdy edge, so you can sleep right to the side without feeling like you'll roll off. It's a Wentworth Mercer design, a National Bed Federation approved brand, and a premium spend, though the construction goes some way to justifying it.
Key features & layer details
Comfort fillings
Natural wool and cotton fillings sit at the top, finely layered for a cosy surface feel. Beneath them, 7000 mini pocket springs add a sumptuous, cushioned quality without softening the underlying support.
Support system
The core is 1000 traditional pocket springs, each encased in its own fabric pocket. Every spring reacts independently to your body shape, which means support where you need it and less disturbance from a partner's movement.
Edge support
Butterfly springs around the border create a sturdy edge, backed by a rod frame that secures the spring system right to the perimeter. In practice, this means you can use the full width of the bed and sitting on the edge feels stable.
Layer details from mattressonline.co.uk product page, September 2026.
Best suited for?
Couples
The 1000 individually pocketed springs react independently to each body, which means less motion transfer when one of you turns over or gets up.
Warm sleepers
Wool, cotton and silk fillings help regulate temperature and breathe well, so the bed should feel less trapped and sticky through the night than a foam mattress.
Back sleepers
A medium firm feel with a core of 1000 pocket springs gives steady support underneath, while the 7000 mini springs soften the surface a little.
Eco-conscious buyers
Natural fillings of wool, cotton and silk replace foam in the comfort layers, giving a breathable mattress made from materials many people prefer.
Heavier sleepers
Firm support from 1000 full-size pocket springs, plus butterfly springs and a rod frame around the border, gives a sturdy feel across the whole bed.
The retailer page describes this mattress as firm, so if you're a lightweight side sleeper or simply prefer a softer, more cradling feel, it's probably too much for you. And given the starting price, budget shoppers will find better value 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.
Wentworth Mercer Premium Naturals 8000 Pocket Mattress
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FAQ's
How firm is the Wentworth Mercer Premium Naturals 8000?
The MattressOnline product page describes it as firm. That said, the natural wool and cotton fillings and the layer of 7000 mini pocket springs soften the surface a little, so it feels supportive rather than hard. Lighter sleepers may still find it slightly too solid.
Does the Wentworth Mercer Premium Naturals 8000 come with a trial?
MattressOnline lists a 100-night trial with this mattress. Keep in mind that's the retailer's own offer rather than a manufacturer promise, so if you buy elsewhere the terms may differ. It's always sensible to confirm the trial before you order.
What is the Wentworth Mercer Premium Naturals 8000 made of?
It combines 8000 springs in total, 1000 full-size pocket springs and 7000 mini pocket springs, with natural fillings of wool, cotton, silk and soft white fibres. It's handcrafted in the UK, conforms to BS7177: 2008 fire resistance standards, and measures 32cm deep.
How long is the guarantee on the Wentworth Mercer Premium Naturals 8000?
The MattressOnline listing includes an 8-year guarantee, and other retailer listings show the same. As it appears on a retailer's page, it's worth confirming the guarantee terms at the point of purchase, particularly if you buy from a different shop.
What sizes does the Wentworth Mercer Premium Naturals 8000 come in?
Five UK sizes: Single, Small Double, Double, King and Super King.
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