Last seen for £349 at Silentnight on 30th September 2026
Silentnight Essentials Pocket 600 Double Sided King Size Mattress
The Silentnight Essentials Pocket 600 is a medium-feel budget pocket spring mattress with 600 zoned Mirapocket springs.
- Zoned springs spread weight evenly
- Double-sided, turn to extend its life
- 60-night trial & 5-year guarantee
Save with the previous model
Some retailers still sell the earlier version of this mattress. These is where it costs less than the current model's best price.
More available sizes
Last seen for £299 at Silentnight on 30th September 2026
Last seen for £229 at Silentnight on 23rd June 2026
Last seen for £349 at Silentnight on 30th September 2026
Last seen for £239 at Silentnight on 30th September 2026
Mattress details
Mattress
Silentnight Essentials Pocket 600 Double Sided Mattress
Size
Firmness
Medium
Construction
Pocket Spring
Depth (cm)
26
Layers
4
Layer Details
Cover
Top Layer
Comfort layer
Layer 2
Single layer of 600 pocket
Key benefits
- Real space for two: The UK king is 15cm wider than the UK double, which means fewer accidental elbows and less negotiating over who sleeps on the join.
- Less disturbance at width: The 600 zoned Mirapocket springs respond individually, and combined with 75cm each for two people sharing, an early alarm on one side is easier to sleep through.
- Extra length for taller sleepers: At 200cm, the UK king is 10cm longer than the UK double, a genuine relief if one of you is approaching six foot.
- Budget-friendly upgrade size: King is often where prices jump; this stays in budget territory, so moving up from a double doesn't have to mean a premium spend.
- Flippable, with help: The double-sided design lets you turn it to even out wear, though at this width it's a two-person job, so rope in your partner.
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 don't match and you want enough width and individual pocket springs to stop one person's movement waking the other. It also suits couples adding a king to a bedroom that meets our suggested 2.7m x 2.9m minimum.
Consider another size if...
You sleep alone, your room is under our suggested 2.7m x 2.9m minimum, or you're furnishing a spare room. We'd recommend the UK double instead, which needs a smaller room, at least 2.6m x 2.8m by our guidance.
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FAQ's
Is the Silentnight Pocket 600 in a UK king big enough for a couple?
Yes, comfortably for most. At 150 x 200cm you get 75cm each for two people sharing, noticeably more than a double offers. The 600 zoned pocket springs also keep movement fairly localised, so the extra width and the spring design work together to cut partner disturbance. Very restless pairs might still prefer sizing up elsewhere in the range.
What room size do I need for the Pocket 600 in a UK king?
We suggest at least 2.7m x 2.9m for a UK king, with more feeling comfortable once wardrobes and bedside tables go in. New build master bedrooms can be tighter than they first appear, so measure the usable floor after furniture, then check you can still walk down both sides of the bed.
Should I choose the Pocket 600 in a UK king or a UK double?
For this mattress, the UK king is 15cm wider and 10cm longer than the UK double. Couples who feel cramped, or anyone approaching six foot, will notice both differences every night. If your room is small or you mostly sleep alone, the UK double keeps costs down and fits rooms from around 2.6m x 2.8m.
Is the UK king Pocket 600 hard to flip?
It's manageable but awkward alone at 150 x 200cm, so treat flipping as a two-person job. Silentnight doesn't publish a weight for this size, which makes it hard to be more precise. Since the double-sided design is one of this mattress's main draws, it's worth planning to turn it regularly rather than letting the chore slide.
Will the king size help if my partner gets up earlier than me?
It should. Pocket springs move independently, so someone climbing out at 5am sends less motion across the bed than an open coil would, and the extra width of the UK king means you're rarely lying close to the disturbance in the first place. Yes, 600 springs is a modest count, but for reducing wake-ups it does the job.