Wentworth Mercer Premium Silk 11000 Pocket Mattress
The Wentworth Mercer Premium Silk 11000 is a pocket spring mattress with natural fillings: silk, wool, cotton and cashgora sit above two layers of springs, 11,000 in total.
- Eases pressure at shoulders & hips
- Cooler in summer, warmer in winter
- Minimises partner disturbance
£1,209
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Wentworth Mercer describes the feel of the Premium Silk 11000 as soft to medium, so it suits sleepers who like a gentle, cushioned surface rather than a firm one. At 28cm deep and handcrafted in the UK, it feels like a traditional, high-end build. It's a serious spend, although the natural materials and dual spring system go some way to justifying it. Mattress Online lists a 100-night trial and an 8-year guarantee with this mattress.
Mattress specifications
Firmness
Medium Firm
Type
Pocket Spring
Depth (cm)
28
Number of Layers
6
Trial Period (nights)
100
Warranty (years)
8
Price Range
£1,209 to £2,429
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 makes sense if you want natural fillings doing the comfort work. Silk and wool are breathable and temperature regulating, which means you should sleep cooler in summer and warmer in winter than you would on an all-foam mattress. The mini pocket springs sit above the main pocket springs and reduce motion transfer, so a restless partner is less likely to wake you. The soft to medium feel favours side sleepers and lighter bodies who need pressure relief at the shoulders and hips. It comes in five UK sizes from Single to Super King, and it carries National Bed Federation approval, a reassuring mark of quality checks behind the label.
Key features & layer details
Silk
A luxurious natural fibre that gives the sleep surface a sumptuous, breathable feel. It stays resilient over time rather than flattening quickly.
Wool
Wool is a natural insulator with good temperature regulation, which means it helps keep you comfortable all year round. Cosy in winter, breathable in summer.
Cotton
Natural cotton fibres wick moisture away from your body and help regulate temperature. The result is a fresher-feeling sleep surface, especially if you run warm.
Soft White Fibres
Soft synthetic fillings add a cosy, cushioned feel to the comfort layers. They are durable and hold their shape well.
Mini Pocket Springs
Small individually cased springs sit near the surface for added comfort and gentle pressure relief. They also cut down motion transfer, so you feel less of a partner's movement.
Pocket Springs
The main support layer: individual springs encased in cloth pockets that respond to each part of your body separately. That means more tailored support along your spine than a traditional open-coil system gives.
Layer details from mattressonline.co.uk product page, September 2026.
Best suited for?
Side sleepers
The soft to medium feel and the mini pocket springs near the surface give gentle pressure relief at the shoulders and hips.
Warm sleepers
Silk, wool and cotton fillings are breathable and help regulate temperature, so you should sleep cooler in summer than on an all-foam mattress.
Couples
Mini pocket springs sit above the main pocket springs to cut motion transfer, so a restless partner is less likely to wake you.
Lighter sleepers
The soft to medium surface suits lighter bodies, letting them sink in enough to feel cushioned without needing firm pushback.
Eco-conscious buyers
Natural silk, wool and cotton do much of the comfort work here, with a handcrafted UK build and National Bed Federation approval.
If you prefer a firm surface or sleep mostly on your front, the soft to medium feel may let your hips sink a little too far. Heavier sleepers who need firmer pushback should also look elsewhere. And if your budget is tight, the starting price puts this out of easy reach.
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 Silk 11000 Pocket Mattress
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FAQ's
How firm is the Wentworth Mercer Premium Silk 11000?
The product page describes it as soft to medium, which suits side sleepers and those who like a gentler, more cushioned surface. Some retailer catalogues list it as medium firm, but the page description of soft to medium is the wording to trust here.
Does the Wentworth Mercer Premium Silk 11000 come with a trial?
Mattress Online lists a 100-night trial with this mattress, along with an 8-year guarantee. These are that retailer's own terms, so check what applies if you buy elsewhere.
What is the Wentworth Mercer Premium Silk 11000 made of?
The comfort layers combine silk, wool, cotton, cashgora and soft white fibres over two spring layers: mini pocket springs for surface comfort and full pocket springs for support, 11,000 springs in total. The mattress is 28cm deep and handcrafted in the UK.
Is the Wentworth Mercer Premium Silk 11000 good for hot sleepers?
It should cope well with warm sleepers. Silk, wool and cotton are all breathable natural fibres that regulate temperature and wick moisture, which means less of the heat build-up you can get with foam-heavy mattresses.
What sizes does the Wentworth Mercer Premium Silk 11000 come in?
It is available in UK Single, Small Double, Double, King and Super King.
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