Wentworth Mercer Premium Silk 11000 Pocket Super King 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
£2,429
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Wentworth Mercer Premium Silk 11000 Pocket Mattress
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Mattress details
Mattress
Wentworth Mercer Premium Silk 11000 Pocket Mattress
Size
Firmness
Medium Firm
Construction
Pocket Spring
Wool
Natural
Depth (cm)
28
Layers
6
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.
Key benefits
- Space to turn without touching: With 90cm each for two sharing, 15cm more each than the UK king gives, you can roll over without nudging your partner awake.
- Distance for a restless partner: Width does most of the work with a fidgety sleeper, and the mini pocket springs near the surface soften the movement that still travels across.
- Room when the household piles in: When a child wanders in during the small hours or a large dog settles at your feet, 180cm of width means the adults still keep a fair share.
- In proportion with a large room: In a period property or a generous master bedroom, a UK king can look slightly lost, whereas 6ft of width sits comfortably against the wall.
- Breathable fillings for a fuller bed: A bed shared by more bodies tends to run warmer, so the silk and wool fillings help keep the surface a little fresher through the night.
This size suits you if...
You share the bed with a restless partner and want proper distance between you, children or a large dog regularly join you overnight, or your bedroom comfortably clears our suggested minimum of 3m x 2.9m.
Consider another size if...
Your room falls short of 3m x 2.9m, or your door and landing turns are tight. We'd recommend the UK king instead, and we suggest at least 2.7m x 2.9m for it.
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FAQ's
Is a UK super king big enough for two adults and a child?
For occasional visits, yes. Two adults get 90cm each, so a small child tucked in the middle still leaves each of you some room. If a child joins you most nights, expect it to feel a little snug by morning, but the UK super king is the widest of this mattress's sizes, so there is no roomier option.
Wentworth Mercer Premium Silk 11000 super king or king: which should I choose?
The UK super king is 30cm wider than the UK king and the same length. That gives each sharer 15cm more, since the UK king gives 75cm each. Choose the UK super king if a restless partner or regular visitors are the issue, and the UK king if your room is closer to our suggested 2.7m x 2.9m.
Will a UK super king fit in a loft conversion bedroom?
It can, but the sloping ceiling usually decides which wall the bed goes against. You need usable floor of at least 3m x 2.9m, and headroom where you sit up to read. The mattress is 28cm deep, so check how high it will sit on your bed frame before you measure the slope.
What should I measure before ordering this mattress in a UK super king?
Measure every doorway, stair turn and landing on the route against 180 x 200cm and a 28cm depth. Check that bedroom doors can still swing open fully once the bed is in place. Budget for super king sheets and a 260 x 220cm duvet too, as your existing bedding is unlikely to fit.
How much more room does a UK super king give than a UK double?
The UK super king is 45cm wider and 10cm longer than the UK double. For two people sharing, the UK double gives 67.5cm each, so the UK super king gives 22.5cm more each. If you are coming from a UK double with a restless partner, you will notice the difference straight away.