Wentworth Mercer Pocket Pro 1500 Super King Mattress
The Wentworth Mercer Pocket Pro 1500 Mattress has 1500 pocket springs under a wool, cashmere and silk blend, which means firm, responsive support with a soft natural layer on top.
- Firm feel for back sleepers
- Handcrafted in the UK
- Glue-free build, easier to recycle
£735
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Wentworth Mercer Pocket Pro 1500 Mattress
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Mattress details
Mattress
Wentworth Mercer Pocket Pro 1500 Mattress
Size
Firmness
Firm
Construction
Pocket Spring
Wool
Depth (cm)
29
Layers
4
Layer Details
Wool, cashmere and silk blend
Two layers of a wool, cashmere and silk blend for plush comfort. They soften the top of a firm mattress a little without changing its rating.
Breathable polyester fibre
Two layers of polyester fibres that create a breathable feel, so the surface should feel less stuffy.
Polyester and cotton blend
Two supportive layers of a polyester and cotton blend, which add comfort and support between the soft top and the springs.
Pocket springs
A core of 1500 pocket springs in cloth pockets. They adapt to your weight and movement, so support comes where you need it.
Layer details from mattressonline.co.uk product page, November 2026.
Key benefits
- 90cm each for two sharing: Each of you gets 90cm of width, which means a restless partner can turn over without their elbow ending up in your half.
- 15cm more each than a UK king: Two sharers gain 15cm per person over the UK king at the same 200cm length, so the extra space goes entirely into width.
- Springs that answer to each sleeper: The 1500 pocket springs respond to weight and movement, so across a bed this wide your side reacts mainly to you, not to whoever is opposite.
- Firm enough for small visitors: A firm surface holds its shape when children or a large dog climb in, so you are less likely to find yourself rolling towards a dip in the middle.
- Double-sided across the full width: You can flip as well as rotate it, which spreads wear evenly over all 180cm, although at this size turning it is a two-person job.
This size suits you if...
You share with a partner who tosses and turns and you want a firm surface with 90cm each, or your mornings regularly begin with a child or the dog wedged between you.
Consider another size if...
Your bedroom is smaller than our suggested 3m x 2.9m, or flipping a 180cm wide mattress would be a struggle. We'd recommend the UK king instead, which needs at least 2.7m x 2.9m.
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FAQ's
Is a UK super king Pocket Pro 1500 big enough for two adults and a child?
For occasional visits, yes. The UK super king gives two adults 90cm each, so a small child in the middle eats into that space without leaving anyone on the edge. If a child sleeps with you every night, the firm surface helps because there is no soft centre for everyone to slide towards.
How much more space is a UK super king than a UK king in this mattress?
The UK super king is 30cm wider than the UK king and the same 200cm length. For two people sharing, that is 15cm more each: 90cm on the UK super king against 75cm on the UK king. The trade-off is room space. We suggest at least 3m x 2.9m for the UK super king and 2.7m x 2.9m for the UK king.
Is the Wentworth Mercer Pocket Pro 1500 super king hard to flip?
It takes more effort than the smaller sizes because you are turning 180 x 200cm of a 29cm deep pocket spring mattress. Plan on two people. Clear space at the foot of the bed first, stand the mattress on its side, then turn it over. Doing this seasonally keeps wear even across the full width.
What size bedroom do you need for a UK super king mattress?
We suggest at least 3m x 2.9m for a UK super king. In a loft conversion, measure where the ceiling slope begins, because you need headroom to sit up on both sides, and that usually decides which wall the bed goes against. In any room, check that the door can still swing fully open once the frame is in.
Will a UK super king mattress fit up my stairs?
Measure before you order. At 180 x 200cm, the tight spots are usually a turn on the landing or a low ceiling over the stairs, where a 29cm deep mattress has to be tipped and angled. Note those measurements, then compare the retailers listed on this page and check their handling guidance for this size.