Wentworth Mercer Premium Naturals 8000 Pocket Super King 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
£1,799
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Wentworth Mercer Premium Naturals 8000 Pocket Mattress
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Mattress details
Mattress
Wentworth Mercer Premium Naturals 8000 Pocket Mattress
Size
Firmness
Medium Firm
Construction
Pocket Spring
Wool
Depth (cm)
32
Layers
3
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.
Key benefits
- Room for a restless partner: With 90cm each, a partner who turns all night sleeps noticeably further from you than on a UK king, which gives 75cm each.
- Movement stays on one side: The 1000 independently pocketed springs react separately, which means a child climbing in on one side is less likely to wake whoever is asleep on the other.
- Usable right to the edge: Butterfly springs and a rod frame firm up the border, so on a crowded night the outer strip of the bed still feels stable to lie on.
- Breathable with a full bed: Wool, cotton and silk fillings let air move through the surface, a real help when two adults and a dog share one mattress and warmth builds up.
- Same length as a UK king: At 200cm long it matches the UK king, so all the extra size goes into width and taller sleepers keep the same legroom.
This size suits you if...
You share with a partner who rarely lies still, or with children and dogs who regularly make their way in, and your bedroom comfortably clears our suggested minimum of 3m x 2.9m.
Consider another size if...
Your bedroom falls short of our suggested 3m x 2.9m, or you sleep alone and would rarely use the full width. We'd recommend the UK king instead, which needs at least 2.7m x 2.9m.
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FAQ's
How much more room is the Wentworth Mercer Premium Naturals 8000 UK super king than the UK king?
The UK super king is 30cm wider than the UK king, and both are the same length. Shared between two people, the UK super king gives you 15cm more each, so 90cm per person rather than 75cm. All of that gain is sideways, which is exactly where a restless sleeper needs it.
Is the Wentworth Mercer 8000 UK super king good if my partner moves a lot at night?
It's a strong choice. The 90cm each puts real distance between you, and the individually pocketed springs mean a partner's movement travels less across the bed. Distance does most of the work here; the spring system helps keep what movement remains on their side.
Can two adults and a child sleep on the Wentworth Mercer 8000 super king?
For a child who joins you part way through the night, yes. The UK super king is the largest standard UK size, and the reinforced border means whoever ends up nearest the side still has a stable surface rather than a soft edge to slide off.
Does the Wentworth Mercer 8000 suit sharing with a large dog?
A 180cm width leaves space for a dog at your feet or between you without either adult losing much. The natural fillings breathe well, which helps because a dog adds noticeable heat. If your dog prefers the edge, the butterfly spring border keeps it supportive there too.
What should I check before ordering the Wentworth Mercer 8000 in a UK super king?
Measure the room against our suggested 3m x 2.9m, though around 3.5m x 3.2m feels more comfortable. Check which way the bedroom door swings and how tight your landing turns are. Budget for super king sheets and a 260 x 220cm duvet, since your current bedding probably won't fit.