Wentworth Mercer Pocket Pro 1500 King Size 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
£629
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Wentworth Mercer Pocket Pro 1500 Mattress
More available sizes
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
- Room to stop bumping elbows: At 75cm each for two sharing, the UK king gives you 7.5cm more personal space each than the UK double, enough to sleep without constantly meeting your partner's arm.
- Length for a taller partner: At 200cm (6ft 6in), it is 10cm longer than a UK double, so a partner over six foot is less likely to end up with feet over the edge.
- Fewer early-morning disturbances: The 1500 pocket springs respond to weight and movement individually, so if one of you rises hours before the other, the wider surface should pass on a little less of it.
- Plan the bedroom first: We suggest at least 2.7m x 2.9m, and a new build master bedroom can feel noticeably tighter once fitted wardrobes and bedside tables are in.
- Flipping is a two-person job: It is double-sided, which spreads wear, but turning a firm UK king over takes real effort and goes far more smoothly with both of you lifting.
- Standard king bedding fits: King sheets and a 230 x 220cm king duvet fit, so you can buy bedding from any UK range without hunting for special sizes.
This size suits you if...
You share the bed every night and have started to feel cramped on a UK double, one of you is close to or over six foot, or you keep different hours and want a little more distance from the partner getting up in the dark.
Consider another size if...
Your bedroom is smaller than our suggested 2.7m x 2.9m. We'd recommend the UK double instead, where we suggest at least 2.6m x 2.8m, although it is 10cm shorter.
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FAQ's
Is the Wentworth Mercer Pocket Pro 1500 UK king big enough for two adults?
For most couples, yes. The UK king gives 75cm each, which is 7.5cm more each than the UK double. If you both sprawl or a dog shares the bed most nights, the UK super king gives 90cm each, 15cm more per person, but needs a bigger room.
Is a UK king Pocket Pro 1500 long enough if you're over six foot?
It is 200cm long, or 6ft 6in, which is 10cm longer than the UK double and the same length as the UK super king. For a partner over six foot, that extra length is often the real reason to size up, more than the width.
What size bedroom do I need for a UK king mattress like the Pocket Pro 1500?
We suggest at least 2.7m x 2.9m, with around 3.2m x 3.2m feeling comfortable. Measure with wardrobe doors open and bedside tables in place, then check your stairs and landing before you compare the retailers listed on this page.
How hard is it to flip the Pocket Pro 1500 in king size?
Harder than in the smaller sizes. It is double-sided and meant to be flipped as well as rotated, but at 150 x 200cm with a firm build, it is awkward for one person. Clear floor space around the bed and do it together.
What bedding fits a Wentworth Mercer Pocket Pro 1500 king size mattress?
King sheets and a 230 x 220cm king duvet fit. The mattress is 29cm deep, so check that any fitted sheet has deep enough pockets to tuck under properly on both sides, especially as you will be flipping it.