Silentnight 800 Mirapocket Mattress
Mattress
Silentnight 800 Mirapocket Mattress
Size
Firmness
Medium Firm
Construction
Depth (cm)
26
Layers
2
Layer Details
- Eco Comfort Fibre. A comfort layer made from sustainable materials including repurposed plastic. It's highly breathable, which means air circulates freely through the mattress for a fresher, cooler feel through the night.
- Mirapocket Springs. 800 individual pocket springs, zoned to give targeted relief to your back, joints and hips. Because each spring moves independently, the mattress responds to your body shape and absorbs movement, so a restless partner is less likely to wake you.
Layer details from mattressonline.co.uk product page, September 2026.
- Real space for one: At 120cm across, the UK small double is 30cm wider than the UK single, so a solo adult can stretch out without the springs running short of you.
- Fits the awkward room: Being 15cm narrower than a UK double, it suits box rooms and loft conversions where a wider bed would block the door or leave no standing room.
- Zoned springs across the full width: The 800 Mirapocket springs give firmer support under your hips wherever you settle, which matters when you've bought this width to roam around in.
- Copes with occasional guests: Two adults can share for a weekend stay, and because each spring moves independently, one person turning over is less likely to disturb the other.
- Breathes rather than bakes: The Eco Comfort Fibre layer lets air move through the mattress, useful in the smaller, warmer rooms this size tends to end up in.
This size suits you if...
You sleep alone and have outgrown a UK single but your room can't take a full double, you're kitting out a guest room where couples stay occasionally rather than nightly, or you're moving a teenager up a size without giving away all their floor space.
Consider another size if...
You share the bed every night and your room measures at least 2.6m x 2.8m. The Silentnight 800 Mirapocket in a UK double is 15cm wider, and that extra width matters more than you'd think over years of shared sleep.
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Will the Silentnight 800 Mirapocket small double fit in a box room?
Usually, yes. The mattress is 120 x 190cm, and we suggest a room of at least 2.4m x 2.8m so you can still open the door, get dressed and change the sheets without shuffling sideways. Measure the wall the bed will sit against before ordering, and check the landing and stairwell if you're heading up to a loft.
Is the Silentnight 800 Mirapocket small double big enough for a couple?
For occasional nights, yes. Two adults get 120cm between them, and the individual pocket springs absorb movement so one person shifting is less likely to wake the other. As an every-night bed for two it's a squeeze, and we'd point full-time couples towards the UK double, which is 15cm wider at the same length.
Is the small double worth it over a single for this mattress?
If the room allows, we think so. The UK small double is 30cm wider than the UK single and exactly the same length, so you gain sprawling room without needing a longer wall. For a teenager who's outgrown a single, or an adult who likes to spread out, that width is the difference between sleeping and perching.
Can I still buy the Silentnight 800 Mirapocket in a UK small double?
Availability is patchy, since the model is listed as discontinued at one major retailer. Stock does still surface, so compare the retailers listed on this page, where prices are updated as retailers change them, and be ready to move if you find it. Bear in mind a like-for-like replacement later may be hard to source.
Does the small double feel firmer than other sizes of this mattress?
No, the medium firm feel is the same across every size. What changes is how you use it: sleeping solo on 120cm of width lets you move across the zoned springs freely, whereas two people sharing will each sit closer to the edges. Some owners found it firmer than expected, so factor that in whichever size you choose.