Silentnight Healthy Growth Astro Eco Comfort Pocket Kids Mattress
Mattress
Silentnight Healthy Growth Astro Eco Comfort Pocket Kids Mattress
Size
Firmness
Medium
Construction
Depth (cm)
24
Layers
3
Layer Details
- Sleep surface. A breathable quilted sleep surface, which means the top of the mattress lets air move through rather than trapping warmth. It's a simple layer doing a simple job.
- Support system. 600 Mirapocket® springs providing zoned support, which Silentnight says is scientifically proven to improve spinal alignment and posture. Each spring moves independently, so support follows your child's shape as they shift about.
- Comfort layer. Breathable EcoComfort Fibres™ sit in the comfort layer for cooler sleep. This is where the mattress gets its softness without using any foam.
Layer details from silentnight.co.uk product page, September 2026.
- Fits a busy child's room: At 3ft wide the UK single leaves floor space free for a desk, wardrobe and toy storage, which matters when the bed is one item among many.
- Made for raised frames: The UK single is the standard fit for bunk beds, cabin beds and mid sleepers, though check your frame's maximum depth against this mattress's 23.5cm before buying.
- Works for shared rooms: Two UK singles plus a walkway fit in rooms where a bigger bed never could, so siblings sharing can each get proper pocket-sprung support.
- Cheap, easy bedding: Single sheets and duvets are the most widely stocked of any size, useful when a child gets through bedding faster than an adult does.
- Room to grow lengthways: At 190cm long, the UK single carries a child well into their teens, so the medium pocket-sprung support isn't outgrown after a couple of years.
This size suits you if...
You're buying for a child's bedroom, a bunk or mid-sleeper frame, or a compact room where the bed has to share space with a desk and wardrobe. It also suits a teenager moving up from a smaller children's bed, or a spare room that doubles as an office. Allow at least 2.1m x 2.8m of floor space and it fits comfortably.
Consider another size if...
Your teenager sprawls in their sleep or has clearly outgrown a 90cm width. We'd recommend the UK small double instead: it's 30cm wider, the same length, and needs a room of at least 2.4m x 2.8m.
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Will the Silentnight Healthy Growth Astro UK single fit a bunk bed?
Yes, the UK single is the standard bunk and mid-sleeper size at 90 x 190cm, and this is the size most parents buy for raised frames. One check first: this mattress is 23.5cm deep, so make sure the top bunk's safety rail still sits high enough above the mattress surface. Frame manufacturers state a maximum depth for exactly this reason.
What are the dimensions of the Silentnight Astro in a UK single?
The UK single measures 90 x 190cm, which is 3ft x 6ft 3in. It's the standard one-person size in the UK, so any single bed frame, divan or bunk sold here will take it. We suggest allowing at least 2.1m x 2.8m of floor space so there's room to move around the bed.
Is a UK single big enough for a teenager?
For most teenagers, yes. At 190cm long it's the same length as a UK double, so height is rarely the issue; width is what some teens outgrow. If yours is a restless sleeper who ends up sideways by morning, the UK small double gives 30cm more width at the same length, provided the room can take it.
How long will a child use a single mattress before sizing up?
Most children move onto a UK single at around the toddler-bed stage and stay on it into their late teens, so this is usually the last mattress size change until adulthood. That's worth bearing in mind here: the Astro's zoned pocket springs are aimed at growing bodies, and the UK single is the size that covers those growing years.
Can two of these singles work in a shared or guest room?
Yes, two UK singles side by side or on opposite walls is a common setup for siblings sharing or a guest room. Each mattress is 90cm wide, so measure your room with a walkway between the beds in mind. Two singles also let each sleeper have independent support, since pocket springs respond to each body separately.