Silentnight Rest Assured Nimbus 2000 Pocket Refresh King Size Mattress - Firmer
The Rest Assured Nimbus 2000 Pocket Refresh is a pocket spring mattress from Silentnight, sold in softer and firmer versions; this is the firmer one.
- Wicks moisture to keep you cooler
- Firm support with a cushioned top
- 60-night trial & 5-year guarantee
£950
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Silentnight Rest Assured Nimbus 2000 Pocket Refresh Mattress - Firmer
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Mattress details
Mattress
Silentnight Rest Assured Nimbus 2000 Pocket Refresh Mattress - Firmer
Size
Firmness
Firm
Construction
Pocket Spring
Depth (cm)
35
Layers
5
Layer Details
Quilted pillowtop
A quilted pillowtop with an advanced breathable sleep system, which means a soft, cushioned surface that's designed to stop you overheating through the night.
Refresh Fibres
Vertical Refresh Fibres quickly channel moisture away from your body. In practice, that means sweat is drawn off before it can leave you feeling clammy.
British wool and fresh fibres blend
Layers of British wool blended with sustainable fresh fibres. Wool naturally regulates temperature, adding a premium, comfortable feel that supports deep, restorative sleep.
Fresh fibres
Horizontally arranged sustainable fresh fibres evaporate moisture out through the breathable mesh border. This helps keep the sleeping environment clean and fresh over time.
Pocket spring support system
Individual pocket springs adjust to your body weight, which means support tailored to your shape rather than a one-size feel. They also isolate movement, so a restless partner is less likely to wake you.
Layer details from silentnight.co.uk product page, September 2026.
Key benefits
- Space to sleep on different schedules: If one of you gets up hours before the other, 75cm each for two people sharing gives the early riser room to slip out with less disturbance.
- Pocket springs matter more at this width: Individual pocket springs isolate movement, and in a UK king the extra distance between you makes that isolation genuinely noticeable.
- Length for taller sleepers: At 200cm long, the UK king is 10cm longer than the UK double, a real difference if either of you is approaching six foot.
- A meaningful step up from a double: The UK king is 15cm wider than the UK double, enough that you feel the change every night rather than just on paper.
- Cooling that suits a shared bed: Two bodies generate more heat than one, so the Refresh Fibres and breathable mesh border do more useful work in this size than in a single.
- Room for the dog: If a pet sleeping on the bed is part of the routine, the extra width means it takes its share without pushing either of you to the edge.
This size suits you if...
You share the bed every night and a double has started to feel cramped, one of you is tall enough that 190cm mattresses leave feet at the edge, or your sleep schedules rarely match and you want the firmer feel of this mattress with enough width that movement on one side stays on one side.
Consider another size if...
Your bedroom is smaller than the 2.7m x 2.9m we suggest for a UK king, or you sleep alone. We'd recommend the UK double instead, which needs around 2.6m x 2.8m and still gives a solo sleeper generous space.
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FAQ's
Is the Nimbus 2000 firmer mattress in a UK king good for couples?
Yes, and it's arguably the size this mattress makes most sense in. You get 75cm each for two people sharing, and the pocket springs adjust to each sleeper's weight independently, so a heavier and lighter partner each get support suited to them. The firm feel holds its shape well when two people share, although lightweight side sleepers may still find it a little solid.
Will a UK king Nimbus 2000 fit in my bedroom?
The mattress measures 150 x 200cm, and we suggest a room of at least 2.7m x 2.9m so you can open wardrobes and walk round both sides comfortably. New build master bedrooms can be tighter than they first appear once furniture goes in, so measure with the wardrobes and bedside tables in place before ordering.
Should I get the Nimbus 2000 in a UK king or a UK super king?
The UK super king is 30cm wider than the UK king, though both are the same 200cm length, so taller sleepers gain nothing by sizing up. If your room meets the 3m x 2.9m we suggest for a UK super king and you want maximum personal space, size up. Otherwise the UK king gives most couples enough room.
Is the king size worth it over the double for this mattress?
The UK king is 15cm wider and 10cm longer than the UK double. The width difference is what you notice: it turns shared movement, one partner getting up early or shifting position, into something the other barely feels, helped by the movement-isolating pocket springs. If either of you is tall, the extra length settles it.
What bedding fits the Nimbus 2000 in a UK king?
Standard UK king sheets fit the 150 x 200cm footprint, with a 230 x 220cm king duvet on top. One caveat specific to this mattress: at 34.5cm deep it needs deep or extra-deep fitted sheets in king size, as standard-depth ones may not stretch over the corners of the pillowtop.