Wentworth Mercer Deluxe Wool 3000 Pocket Mattress
The Wentworth Mercer Deluxe Wool 3000 Pocket Mattress pairs 3000 pocket springs with natural wool and soft synthetic fillings, which means responsive support underneath and a plush, breathable feel on top.
- Wool helps in summer & winter
- Support tailored to each partner
- Plush, cosy surface feel
£599
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The Wentworth Mercer Deluxe Wool 3000 sits at 29cm deep and is listed as Medium in firmness, although one owner found it firmer than that at first. It comes in five UK sizes, from Single to Super King. It's handcrafted in the UK and comes from a National Bed Federation Approved Brand, with a 5 year guarantee. If you like natural fillings but don't want memory foam's hug, this is a sensible shortlist candidate.
Mattress specifications
Firmness
Medium Firm
Type
Pocket Spring
Depth (cm)
29
Number of Layers
3
Trial Period (nights)
100
Warranty (years)
5
Price Range
£599 to £1,049
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?
The main draw here is the wool. It's naturally temperature-regulating, which means it helps in both summer and winter rather than trapping heat the way some synthetic-heavy mattresses can. Beneath it, 3000 pocket springs made from twice tempered steel adapt individually to your body shape, so you and a partner get support tailored to each of you rather than a shared, wobbly middle. At 29cm deep it has a substantial, traditional feel. Buying through Mattress Online adds a 100-night trial and free next day weekday delivery, with old mattress removal available for an extra charge. The guarantee is 5 years, shorter than some brands offer, but the starting price keeps it reasonable for a wool pocket sprung mattress.
Key features & layer details
Soft White Fibres
Soft synthetic fillings topped with a polyester layer, which means a cosy surface feel the moment you lie down. They're inherently breathable, so this comfort layer shouldn't hold onto heat.
Wool
A generous layer of natural wool fibres gives deep, plush comfort. Wool is naturally temperature-regulating, which means it works all year round, warming in winter and wicking heat in summer.
Pocket Springs
3000 traditional pocket springs made from twice tempered steel, which means each spring responds to your body shape independently rather than the whole surface moving as one. The result is strong, personalised support and less partner disturbance.
Layer details from mattressonline.co.uk product page, September 2026.
Best suited for?
Couples
The 3000 pocket springs respond individually to each body, which means you and a partner get tailored support instead of a shared, wobbly middle.
Warm sleepers
Wool is naturally temperature-regulating and the soft white fibre layer is breathable, so the surface should not trap heat the way synthetic-heavy mattresses can.
Back sleepers
Twice tempered steel pocket springs give strong, personalised support under a medium firm feel, which suits those who want a steady surface beneath them.
Eco-conscious buyers
A generous layer of natural wool fibres forms the main comfort filling, and the mattress is handcrafted in the UK by a National Bed Federation Approved Brand.
If you sleep hot and prefer a shallow, springy modern hybrid, the deep fibre and wool fillings may feel too plush and traditional. Lightweight side sleepers wanting a genuinely soft surface should also be cautious: it's listed as Medium, but at least one owner found it firm at first.
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 Deluxe Wool 3000 Pocket Mattress
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FAQ's
How firm is the Wentworth Mercer Deluxe Wool 3000?
The product page lists it as Medium. That said, one customer described it as firm rather than medium when new, noting it softened with use and a topper. If you're a lighter sleeper or firmly prefer a soft feel, treat it as sitting toward the firmer side of medium.
Does the Wentworth Mercer Deluxe Wool 3000 come with a trial?
Mattress Online lists a 100-night trial with this mattress. That trial is the retailer's own offer rather than a manufacturer promise, so if you buy elsewhere, check that seller's returns terms before ordering.
How long is the guarantee on this mattress?
It comes with a 5 year guarantee, as listed by the retailer. That's shorter than some brands offer, but reasonable at a mid-range starting price.
Is the Wentworth Mercer Deluxe Wool 3000 good for hot sleepers?
It should cope well with moderate overheating. The wool layer is naturally temperature-regulating and the soft white fibre layer is breathable, so heat has routes to escape. There's no foam to trap warmth, which helps.
What sizes does the Wentworth Mercer Deluxe Wool 3000 come in?
Five UK sizes: Single, Small Double, Double, King and Super King.
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