Silentnight Comfort Breathe 800 Mattress
Mattress
Silentnight Comfort Breathe 800 Mattress
Size
Firmness
Construction
Depth (cm)
25
Layers
5
Layer Details
- Sleep surface. A naturally hypoallergenic fabric that's soft and gentle on the skin. A reassuring choice if you're sensitive to allergens.
- Comfort Breathe®. Silentnight describes these fibres as 15x more breathable than standard memory foam, promoting airflow and regulating temperature. In practice, that means a cooler surface for hot sleepers.
- 800 Mirapocket spring unit. 800 individual pocket springs respond separately to your body's movements, which means zoned support and better spinal alignment. You shouldn't roll towards a partner every time they turn over.
- Protective Layer. This layer disperses pressure from the spring unit across the mattress. It's there to help the mattress last longer.
- Durable case. A soft, hard-wearing case designed to keep the mattress comfortable for years to come.
Layer details from silentnight.co.uk product page, September 2026.
- Real room for one: The UK small double is 30cm wider than the UK single, which means a solo sleeper can shift position freely without an edge appearing under an elbow.
- Fits compact bedrooms: At 15cm narrower than the UK double, this size squeezes into box rooms and studios where the extra width would block a door or a wardrobe.
- Springs sized for solo use: With 800 pocket springs and one sleeper across 120cm of width, the zoned support settles under your body alone, undisturbed all night.
- Cool surface in a small room: Compact rooms warm up quickly, so the Comfort Breathe fibre layer, described by Silentnight as 15x more breathable than standard memory foam, matters more here.
- Easy to dress: 4ft is a standard UK size, so small double fitted sheets are simple to find and a standard double duvet drapes generously.
This size suits you if...
You're a solo adult who has outgrown a single but your room can't take a standard double, or you're furnishing a guest room where couples stay occasionally rather than nightly. It also suits a teenager ready for a proper adult bed in a room that still needs floor space. The medium feel and breathable top make it a sensible pick if you run warm.
Consider another size if...
You share the bed every night, or your room comfortably clears 2.6m x 2.8m. In that case we'd recommend the UK double instead, which is 15cm wider and gives a couple a far more workable night.
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Is a small double big enough for the Silentnight Comfort Breathe 800 to suit a couple?
For occasional nights, yes. Two people can share a UK small double for a weekend stay, which makes this a practical guest room choice. For every night, the width feels tight, and one of you will notice each turn. Couples sharing nightly should look at the UK double, which is 15cm wider and needs a room of at least 2.6m x 2.8m.
What room size do I need for a small double mattress?
We suggest allowing at least 2.4m x 2.8m for the UK small double. That leaves enough clearance to walk round the bed and open drawers without shuffling sideways. In a box room or loft conversion, measure where the door swings and where the ceiling slopes before you commit, because width is usually what decides whether the layout works.
Is the Silentnight Comfort Breathe 800 small double good for a teenager?
It's a strong fit. The UK small double gives a growing teenager 30cm more width than the UK single they've likely outgrown, while the mattress is the same 190cm length, so the bed doesn't eat much extra floor space. The medium feel suits most sleeping positions, and the breathable fibre layer helps in a small, warm bedroom.
How much smaller is a small double than a double?
The UK small double is 15cm narrower than the UK double, and the two are the same length. That 15cm sounds modest, but in a compact bedroom it can be the difference between a door that clears the bed frame and one that doesn't. If your room allows at least 2.6m x 2.8m, the UK double is the better long-term buy for sharing.
Where can I buy the Silentnight Comfort Breathe 800 in a small double?
Availability shifts, so the most reliable answer is the live comparison table on this page, where prices are updated as retailers change them. Check the size name carefully at checkout: 4ft small double and 4ft 6in double are easy to mix up, and the boxes look similar on a listings page.