Firmness
Type
Hybrid
Depth (cm)
23
Number of Layers
5
Trial Period (nights)
60
Warranty (years)
5
Price Range
£259
Best Sleeping Position(s)
Certifications
Assessed from Silentnight's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
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 this price. Yes, £259 is 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 & what's inside
- 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.
Who's it NOT for?
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.
Silentnight Healthy Growth Lunar Eco Memory Miracoil Kids Mattress
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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, priced at £259, 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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