Silentnight Healthy Growth Cosmo Eco Comfort Kids Mattress
The Silentnight Healthy Growth Cosmo Eco Comfort is a kids' mattress built around EcoComfort Fibres™, a breathable comfort filling, sitting on an open coil spring system.
- Airflow border helps kids sleep cooler
- Supportive feel, not sink-in soft
- 60-night trial & 5-year guarantee
£239
Get the lowest price we've found
The Silentnight Healthy Growth Cosmo Eco Comfort comes in UK Single only, at 23cm deep, with a Medium/Firm feel that gives growing bodies steady, even support. Silentnight lists it as hypoallergenic and free from foam and FR chemical treatments, which many parents will find reassuring. It sits at a sensible price for a child's bed, and it arrives with a 60-night trial and a 5-year guarantee, so there's time to be sure it suits.
Mattress specifications
Firmness
Medium Firm
Type
Eco-Friendly Mattress
Depth (cm)
23
Number of Layers
3
Trial Period (nights)
60
Warranty (years)
5
Price Range
£239
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Combination 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?
The main reasons to pick this one are breathability and simplicity. The EcoComfort Fibres™ comfort layer and airflow border are designed to keep air moving, which means a child who runs warm at night is less likely to overheat. Underneath, interconnected open coil springs give a Medium/Firm, slightly traditional feel: supportive rather than sink-in soft, which generally suits children well. It's foam free and free from FR chemical treatments, and Silentnight lists it as hypoallergenic. Add the 60-night trial and 5-year guarantee, and it's a low-risk buy. It's a simple construction, but for a kids' bed that simplicity is arguably a strength.
Key features & layer details
Sleep surface
A quilted sleep surface fabric on top, which means a soft, cushioned first feel before the firmer support kicks in.
Comfort layer
Breathable EcoComfort Fibres™ with an airflow border. This layer is there to keep air circulating, so your child is less likely to wake up hot and restless.
Support system
An open coil traditional spring system with interconnected springs. The whole surface moves as one, giving a firmer, more uniform feel than pocket springs.
Layer details from silentnight.co.uk product page, September 2026.
Best suited for?
Children
Made as a kids' mattress, its Medium/Firm open coil feel gives steady, even support that is supportive rather than sink-in soft for growing bodies.
Warm sleepers
The breathable EcoComfort Fibres™ comfort layer and airflow border keep air moving, so a child who runs warm is less likely to wake up hot.
Allergy sufferers
Silentnight lists it as hypoallergenic, and it is free from foam and FR chemical treatments, which gives parents extra reassurance for a child's bed.
Eco-conscious buyers
Its foam free build and lack of FR chemical treatments, plus a fibre comfort layer over simple springs, suit anyone wanting a plainer, more natural construction.
Budget buyers
Described as sensibly priced for a child's bed, it also comes with a 60-night trial and 5-year guarantee, so there is little risk in trying it.
It's only made in UK Single, so it won't work if your child sleeps in a small double or you want a matching adult size. And if you'd prefer a softer, more contouring feel, or the independent support of pocket springs, this Medium/Firm open coil design isn't the one.
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 Cosmo Eco Comfort Kids Mattress
Select a comparison article below or choose to compare this mattress side by side with up to 2 other mattresses.
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
FAQ's
Is the Silentnight Healthy Growth Cosmo Eco Comfort suitable for children?
Yes, it's designed as a kids' mattress. Silentnight lists it as hypoallergenic and free from foam and FR chemical treatments, and the Medium/Firm feel gives growing bodies firm, even support rather than a soft, sink-in surface.
How deep is the Silentnight Healthy Growth Cosmo mattress?
It's 23cm deep, a fairly standard depth that should suit most children's bed frames and fitted single sheets without any trouble.
Does the Silentnight Healthy Growth Cosmo come with a trial or guarantee?
Silentnight offers a 60-night trial and a 5-year guarantee on this mattress, so you have two months to see how your child settles on it, with longer-term cover behind that.
What firmness is the Silentnight Healthy Growth Cosmo Eco Comfort?
Silentnight rates it Medium/Firm. In practice that means a supportive, slightly traditional feel from the open coil springs, softened at the surface by the quilted fabric and EcoComfort Fibres™ layer.
How long does delivery take for the Silentnight Healthy Growth Cosmo?
Silentnight lists delivery in 14 days for this mattress.
Couldn't find an answer to your question? Send us a message