Wentworth Mercer Natural Pocket 1500 King Size Mattress
The Wentworth Mercer Natural Pocket 1500 is a medium to firm pocket spring mattress, handcrafted in the UK.
- Minimises partner disturbance
- Cotton wicks away moisture
- Holds its shape without dips
£604
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Wentworth Mercer Natural Pocket 1500 Mattress
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Mattress details
Mattress
Wentworth Mercer Natural Pocket 1500 Mattress
Size
Firmness
Medium Firm
Construction
Pocket Spring
Wool
Natural
Depth (cm)
29
Layers
3
Layer Details
Cotton and Polyester Blend
Two layers blending cotton and polyester fibres, which means cushioned comfort where your body meets the mattress. The cotton wicks away moisture while the polyester increases airflow, helping you stay cooler through the night.
Soft White Fibres
Two layers of soft white fibres that enhance breathability and add durability. In practice, this helps the mattress hold its shape rather than developing dips over time.
Pocket Springs
1500 responsive pocket springs, each sewn into its own fabric pocket before being bonded together, so they can move individually as well as working as a team. This means the springs follow your shape and limit motion transfer from a restless partner.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- Room to spread out: Two people sharing get 75cm each, which is 7.5cm more per person than the UK double, enough to stop elbows meeting when one of you turns over.
- Fewer early morning wake-ups: The springs sit in individual pockets and move independently, which means a partner leaving for an early shift is less likely to jolt you awake.
- Extra length for taller sleepers: At 200cm long, the UK king adds 10cm over the UK double, so a taller partner's feet are far less likely to hang off the end.
- Space to prop and reposition: The wider surface gives you space for extra pillows during pregnancy or the months afterwards, while the medium firm feel stays supportive as you change position.
- A realistic step up: You gain noticeably more space than a UK double without needing the larger bedroom a UK super king asks for.
This size suits you if...
You share the bed every night and one of you keeps waking the other, perhaps because your working hours don't line up. It also suits you if one partner is tall and has been sleeping diagonally on a double, or you're expecting and want space for a support pillow without taking over the other side.
Consider another size if...
Your bedroom falls short of our suggested 2.7m x 2.9m, or you mostly sleep alone. We'd recommend the UK double instead, for which we suggest at least 2.6m x 2.8m.
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FAQ's
Will I feel my partner move on the Natural Pocket 1500 in a UK king?
You should feel a lot less than on a single-unit spring mattress. Each spring is sewn into its own pocket, so movement stays mostly on one side, and the UK king gives each of you 75cm, a little more buffer between you. If your partner is especially restless, a UK super king adds more distance again.
Is the Natural Pocket 1500 UK king long enough for a tall person?
It's 200cm long, which is 10cm longer than a UK double. If height is the reason you're upgrading, that extra length is often what makes the difference. The UK super king is the same length, so sizing up beyond the UK king gains you width only, not more room for your feet.
Should we choose the UK king or the UK super king Natural Pocket 1500?
The UK super king gives 90cm each for two sharing, so the UK king gives 15cm less per person. The UK king suits most couples, although if a child or dog regularly joins you, the UK super king may be worth it. We suggest at least 3m x 2.9m for the UK super king.
How much space per person does the Wentworth Mercer Natural Pocket 1500 UK king give?
Two people sharing get 75cm each. That's 7.5cm more per person than the UK double, which gives 67.5cm each. It sounds modest on paper, but it's the kind of gap that means you can roll over without meeting your partner halfway.
Will a Natural Pocket 1500 UK king fit in a new build master bedroom?
We suggest allowing at least 2.7m x 2.9m for a UK king. New build master bedrooms can feel smaller than their floor plan once fitted wardrobes are in, so measure the clear floor space rather than the full room. If you come up short, the UK double needs at least 2.6m x 2.8m.