Wentworth Mercer Deluxe Wool 3000 Pocket King Size 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
£869
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Wentworth Mercer Deluxe Wool 3000 Pocket Mattress
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Mattress details
Mattress
Wentworth Mercer Deluxe Wool 3000 Pocket Mattress
Size
Firmness
Medium Firm
Construction
Pocket Spring
Wool
Natural
Depth (cm)
29
Layers
3
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.
Key benefits
- More room each: At 75cm per person, the UK king gives each of you 7.5cm more than a UK double, which means fewer knees and elbows meeting in the night.
- Calmer nights on different schedules: The independent pocket springs, spread across a wider bed, mean that when one of you gets up hours before the other, the sleeper is less likely to feel it.
- Length for taller sleepers: At 200cm (6ft 6in) long, the UK king adds 10cm over a UK double, so taller sleepers can stretch out without their feet hanging over the edge.
- Fits rooms a super king won't: We suggest at least 2.7m x 2.9m for the UK king, compared with 3m x 2.9m for the UK super king, so it suits many master bedrooms.
- Wool for two sleepers' warmth: The natural wool layer helps regulate temperature, which helps when two people's body heat builds up under one king duvet.
This size suits you if...
You share the bed every night and a UK double has started to feel cramped, or one of you is around 6ft and wants the extra length without giving up the floor space a UK super king would take.
Consider another size if...
Your bedroom is smaller than our suggested 2.7m x 2.9m. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
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FAQ's
Is the Wentworth Mercer Deluxe Wool 3000 UK king big enough for two people?
For most couples, yes. The UK king gives you 75cm each, which is 7.5cm more per person than the UK double. If you both sprawl, or a dog regularly joins you, the UK super king gives 90cm each, although that needs a bigger room.
Will I feel my partner getting up on a Wentworth Mercer king size mattress?
Less than on a smaller bed. The 3000 pocket springs respond individually, so movement stays fairly local, and the UK king puts 75cm of space between your halves rather than the 67.5cm each a UK double gives. Light sleepers with an early-rising partner should notice the difference.
Is the Wentworth Mercer Deluxe Wool 3000 in a UK king long enough for tall sleepers?
It measures 200cm, or 6ft 6in, which is 10cm longer than the UK double and the same length as the UK super king. If one partner is around 6ft, the UK king gives you that extra length without having to go wider than you need.
Should I buy the UK king or UK super king of this mattress?
Choose on your room first. We suggest at least 2.7m x 2.9m for the UK king and 3m x 2.9m for the UK super king. The UK king gives 15cm less width each, but both are the same length, so taller sleepers lose nothing by choosing the UK king.
Will a UK king mattress fit in a new build master bedroom?
Often, but measure after the wardrobes and furniture are in, because new build rooms can feel smaller than the floor plan suggests. Allow at least 2.7m x 2.9m, with 3.2m x 3.2m giving comfortable space to walk round both sides and open drawers.