Silentnight Healthy Growth Lunar Eco Memory Miracoil Kids Mattress
The Silentnight Healthy Growth Lunar Eco Memory Miracoil is a firm hybrid mattress for children, available in a UK Single.
- Cocooning comfort without the heat
- Head-to-toe support as they grow
- 60-night trial & 5-year guarantee
£259
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The Silentnight Healthy Growth Lunar pairs EcoMemory Fibres™, which gently mould to your child's shape, with Miracoil® springs for head to toe support and healthy spinal alignment as they grow. At 23cm deep it feels like a proper grown-up mattress rather than a thin kids' pad. It's hypoallergenic and free from foam and FR chemical treatments, which will reassure parents wary of what goes into a child's bed. Silentnight backs it with a 60-night trial and a 5-year guarantee. Being a firm feel, very light children may find it takes a little getting used to.
Mattress specifications
Firmness
Firm
Type
Hybrid
Depth (cm)
23
Number of Layers
5
Trial Period (nights)
60
Warranty (years)
5
Price Range
£259
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Certifications
Assessed from Silentnight's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
This mattress is built around growing bodies. The Miracoil® spring system is scientifically proven to improve spinal alignment and posture, which matters more for children than plush comfort layers do. Above the springs, breathable EcoMemory Fibres™ cocoon your child's shape without the heat build-up traditional memory foam can cause, and the quilted sleep surface helps regulate body temperature through the night. It's also free from foam and FR chemical treatments, a genuinely rare reassurance at an affordable starting price. Yes, it costs more than a basic kids' mattress, but a 5-year guarantee and 60-night trial mean you're not gambling on it. If your child runs warm at night, the breathable construction is a real point in its favour.
Key features & 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.
Best suited for?
Children
Built around growing bodies, the Miracoil springs give head to toe support, so your child gets a proper supportive sleep surface as they grow.
Teenagers
At 23cm deep with a firm feel, it comes across as a proper grown-up mattress rather than a thin kids' pad, which suits older children.
Warm sleepers
The breathable quilted top, breathable border and EcoMemory Fibres help air move through, so it avoids the heat build-up traditional memory foam can cause.
Allergy sufferers
It is hypoallergenic and free from foam and FR chemical treatments, which gives reassurance to parents wary of what goes into a child's bed.
Eco-conscious buyers
EcoMemory Fibres replace traditional memory foam, and the mattress is free from foam and FR chemical treatments, so there is less to worry about in the bed.
This is a firm mattress, so very light children who sleep on their side may find it a little unyielding at first. It only comes in a UK Single, so it won't suit a double bed or an adult spare room. And if you want an all-foam feel, the springs here give a different, bouncier character.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Silentnight Healthy Growth Lunar Eco Memory Miracoil Kids Mattress
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FAQ's
Is the Silentnight Healthy Growth Lunar mattress firm or soft?
Silentnight rates it as firm. That firmer feel comes from the Miracoil® springs, which are designed to keep a growing spine well aligned, although lightweight side sleepers may find it takes a short adjustment period.
Does the Silentnight Healthy Growth kids mattress have a trial period?
Yes. Silentnight offers a 60-night trial, so your child can sleep on it at home before you fully commit. It also comes with a 5-year guarantee.
Is the Silentnight Healthy Growth Lunar mattress chemical free?
It's free from foam and FR chemical treatments, and it's hypoallergenic too. That makes it a reassuring choice if your child has allergies or you're cautious about chemical treatments in a child's bed.
How deep is the Silentnight Healthy Growth Lunar mattress?
It's 23cm deep, which is a substantial depth for a children's mattress. Standard single fitted sheets should fit without any trouble.
What sizes does the Silentnight Healthy Growth Lunar mattress come in?
It's available in UK Single only, with delivery listed at 14 days. If you need a small single or a larger size, you'll need to look at a different model.
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