Wentworth Mercer Deluxe Naturals 5000 Pocket Super King Mattress
The Wentworth Mercer Deluxe Naturals 5000 is a soft to medium pocket spring mattress with natural wool and cotton fillings, handcrafted in the UK.
- Cool in summer, warm in winter
- Minimises partner disturbance
- Gentle feel suits side sleepers
£1,399
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Wentworth Mercer Deluxe Naturals 5000 Pocket Mattress
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Mattress details
Mattress
Wentworth Mercer Deluxe Naturals 5000 Pocket Mattress
Size
Firmness
Medium Soft
Construction
Pocket Spring
Wool
Depth (cm)
29
Layers
4
Layer Details
Wool
Natural wool fibres with temperature regulating properties, which means the mattress helps you stay cool in summer and warm in winter. Wool is a genuinely useful top layer for anyone who runs hot at night.
Cotton
Natural cotton fibres keep the sleeping surface fresh, regulating body temperature and wicking away moisture. In practice, this means a drier, more breathable feel than all-synthetic comfort layers.
Soft White Fibres
Soft synthetic fillings that create a cosy, cushioned feel. They're durable and resilient, so the layer should hold its shape rather than flattening quickly.
Pocket Springs Support System
5000 pocket springs made from twice tempered steel, each encased in its own fabric pocket so it moves independently. That means support that follows your body's shape, with less motion transfer across the bed.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- 15cm more each than a UK king: Two sharers get 90cm each here, compared with 75cm on the UK king, which means noticeably more room to stretch out without meeting your partner's elbow.
- Distance and springs working together: The 5000 pocket springs move independently, and with 90cm between you, a partner's tossing and turning is much less likely to reach your side.
- Space for a small visitor: The UK super king is 30cm wider than the UK king, so when a child or dog climbs in, the two adults still keep a reasonable share.
- A gentle feel with room to move: The medium soft surface suits side sleepers, and on a UK super king each of you can change position freely rather than edging towards the middle.
- Fresher with extra bodies in the bed: Wool and cotton fillings help wick moisture away, which is useful when a child or pet adds warmth to a bed as large as a UK super king.
This size suits you if...
You share with a partner who tosses and turns, or your nights regularly end with a child or a large dog in the bed, and your bedroom comfortably clears our suggested 3m x 2.9m.
Consider another size if...
Your bedroom falls short of our suggested 3m x 2.9m, or you sleep alone. We'd recommend the UK king instead, and for that size we suggest at least 2.7m x 2.9m.
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FAQ's
Is the Deluxe Naturals 5000 super king big enough for two adults and a child?
For occasional visits, usually yes. The UK super king gives two adults 90cm each, so a small child tucked between you takes some space without pushing anyone to the edge. Because the feel is medium soft, a child in the middle will sink in a little, so the adults may notice slightly more movement than they would on a firmer mattress.
Deluxe Naturals 5000 in UK king or UK super king for a restless partner?
If movement is the main problem, the UK super king is the stronger choice. The pocket springs already limit how far a partner's movement travels. The extra width also helps: 90cm each against 75cm each on the UK king, so you get 15cm more distance from a restless partner. For a very restless sleeper, that distance often matters more than any comfort layer.
Will a Deluxe Naturals 5000 super king fit in a loft conversion bedroom?
It can, but a sloping ceiling usually decides where the bed goes. You will want the headboard against the full-height wall, with at least 3m x 2.9m of usable floor around it. Headroom where the ceiling drops is easy to forget, so measure it on both sides of the bed before you order the UK super king.
Is the Deluxe Naturals 5000 super king good for sharing with a large dog?
A large dog is where the extra width of the UK super king pays off, since it is 30cm wider than the UK king. The soft surface does mean a heavy dog will make a dip wherever it settles. Across a bed this wide, though, that dip is less likely to sit right beside you.
What should I check before ordering the Deluxe Naturals 5000 in a UK super king?
Check which way your bedroom door opens, and measure any tight turns on the landing, because a 180cm wide mattress is awkward to manoeuvre. Budget for bedding too: you will need super king sheets and a 260 x 220cm duvet. Then compare the retailers listed on this page, as the prices shown are updated when retailers change them.