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)
Certifications
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
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 & what's inside
- 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.
Who's it NOT for?
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 with prices from £949.00 rising to £1,799 for larger sizes, budget shoppers will find better value elsewhere.
Wentworth Mercer Premium Naturals 8000 Pocket Mattress
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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. Prices range from £949 to £1,799 depending on the size you choose.
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