Silentnight Healthy Growth Lunar Eco Memory Miracoil Kids Mattress
Mattress
Silentnight Healthy Growth Lunar Eco Memory Miracoil Kids Mattress
Size
Firmness
Construction
Depth (cm)
23
Layers
5
Layer Details
- Quilted sleep surface. A sumptuous quilted top that's highly breathable, which means your child sleeps cooler and wakes more refreshed. It also helps regulate body temperature through the night.
- Comfort layer. A highly breathable comfort layer sitting just beneath the surface. It adds a touch of softness before the supportive layers below.
- EcoMemory Fibres™. Breathable fibres that cocoon your child's body shape as they sleep, which means gentle, contouring comfort without the warmth of traditional memory foam.
- Miracoil® springs. These springs give head to toe support and are scientifically proven to improve spinal alignment and posture. For a growing child, that support is the layer that matters most.
- Border. A highly breathable border around the edge of the mattress. It lets air move through the sides, helping the whole mattress stay fresh.
Layer details from silentnight.co.uk product page, September 2026.
- Fits the room your child actually has: At 90cm wide it leaves floor space for a wardrobe, a desk and the inevitable toy storage, and we suggest a room of just 2.1m x 2.8m.
- Standard bunk and mid-sleeper fit: The 90 x 190cm footprint matches UK bunk beds, cabin beds and mid sleepers, though check your frame's maximum mattress depth against its 23cm height first.
- Room to grow into: At 6ft 3in long, a UK single carries a child from their first big bed right through the teenage years without a mid-childhood replacement.
- Works where two beds share a room: Siblings sharing a bedroom can fit two UK singles with a walkway between them in most UK children's rooms, which a wider size rarely allows.
- Cheap, easy bedding: Single sheets and duvets are the most widely stocked and lowest priced of any UK size, which matters when a child gets through bedding quickly.
This size suits you if...
You're buying for a child or teenager moving into their own full-size bed, you need a mattress for a bunk, cabin or mid-sleeper frame, or you're fitting a proper supportive mattress into a compact bedroom where every centimetre of floor space counts.
Consider another size if...
You want this mattress in a double bed or for two people to share. Silentnight makes it in a UK single only, so a couple or an adult who likes to spread out will need a different mattress in a UK double or larger.
Similar Mattresses in This Price Range
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
Will the Silentnight Healthy Growth mattress fit a bunk bed?
In footprint, yes: at 90 x 190cm it matches the standard UK single frame used by most bunks, cabin beds and mid sleepers. The one thing to check is depth. It's 23cm deep, which feels reassuringly grown-up but can sit above the safety rail on some upper bunks, so measure your frame's maximum mattress height before buying.
Is a UK single big enough for a teenager?
Usually, yes. The UK single is 190cm long, which is 6ft 3in, so most teenagers have room to stretch out for years to come. Width is the tighter dimension at 90cm, fine for one sleeper but with little space to sprawl. A particularly tall or restless teen might eventually prefer more room, but for most this size lasts through school.
How much floor space does a UK single need in a child's room?
We suggest at least 2.1m x 2.8m of floor space for a UK single, and that allowance is ours rather than Silentnight's. In practice a child's room also has to hold a wardrobe, a desk and toy storage, so the single's 90cm width is a real advantage: it's the size that leaves space for everything else.
Can two of these fit in a shared kids' room?
Often, yes. Two UK singles side by side take up 180cm of width plus a walkway between them, which most average UK children's rooms can manage with some planning. It's the usual arrangement for siblings sharing, and each child gets the same firm, supportive mattress rather than compromising on one shared bed.
What bedding do I need for the Healthy Growth Lunar in a UK single?
Standard UK single bedding fits: single fitted sheets and a single duvet, which measures 135 x 200cm. Single bedding is the cheapest and most widely available of any size, useful when children's bedding needs replacing often. Given the mattress is 23cm deep, a fitted sheet with a reasonably generous depth will sit more securely.