MattressNextDay Kids Waterproof Foam Mattress
The MattressNextDay Kids Waterproof Foam Mattress is a firm, 14cm-deep foam mattress made for children, available in UK Single.
- Waterproof, machine-washable cover
- Firm support for growing bodies
- 5-year guarantee
£159
Get the lowest price we've found
The MattressNextDay Kids Waterproof Foam Mattress uses EcoFoam®, a foam made from 100% recycled and re-engineered material, which means a supportive, orthopaedic-feel surface that resists dust mites, helpful if your child has allergies. The removable cover is waterproof, machine-washable and wipe-clean, so night-time accidents are far less stressful to deal with. It's made in the UK by an NBF-approved manufacturer, comes with a 5-year guarantee, and MattressNextDay offers free next day delivery to mainland UK, though some addresses may incur a small fee. It's a simple two-part design, but for a child's bed that simplicity is arguably a strength.
Mattress specifications
Firmness
Firm
Type
Foam
Depth (cm)
14
Number of Layers
2
Trial Period (nights)
Warranty (years)
5
Price Range
£159
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Certifications
BS 7177
Assessed from MattressNextDay'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 reason to pick this one is practicality. The waterproof cover unzips for the washing machine and wipes clean for smaller spills, which means you're not scrubbing at a foam core after an accident. The EcoFoam® layer is firm and pressure-relieving, giving growing bodies proper support, and it's naturally dust mite resistant and hypoallergenic. Parents who care about materials will like that the foam is 100% recycled and the mattress is vegan friendly. With a 5-year guarantee, it sits at a sensible price for a children's mattress that should last through the primary school years. It meets the BS 7177 domestic flammability standard, tested to Source 5 fire retardancy.
Key features & layer details
EcoFoam®
A firm, orthopaedic foam layer made from 100% recycled and re-engineered foam, which means solid, even support for a growing child. It's highly breathable, pressure-relieving and naturally dust mite resistant, and the resilient construction should hold its shape well over time.
Waterproof Cover
A breathable waterproof cover that protects the foam from accidents without making the surface feel sweaty. It's removable and machine-washable, and you can simply wipe it clean for little spills.
Layer details from mattressnextday.co.uk product page, September 2026.
Best suited for?
Children
The waterproof, machine-washable cover and firm EcoFoam® layer make this a practical children's mattress, giving growing bodies solid support while night-time accidents are easy to clean up.
Allergy sufferers
The EcoFoam® layer is naturally dust mite resistant and hypoallergenic, which means fewer worries about allergens building up in a child's bed.
Eco-conscious buyers
The foam is made from 100% recycled and re-engineered material and the mattress is vegan friendly, so it suits parents who care about what their child sleeps on.
Bunk beds
At just 14cm deep and with a UK Single size, it fits neatly into a bunk bed, where a slimmer mattress helps keep safe clearance above.
This is a children's mattress, so it's not the right pick for adults or teenagers who need a full-depth mattress: at 14cm it's slimmer than a standard adult foam mattress. It only comes in UK Single, and if your child prefers a softer, more cushioned feel, the firm surface may take some getting used to.
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.
MattressNextDay Kids Waterproof Foam Mattress
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FAQ's
Is the MattressNextDay kids waterproof mattress machine washable?
The mattress itself isn't washable, but the waterproof cover is. It zips off and goes in the washing machine, and for smaller spills you can simply wipe it clean without removing it.
How firm is the MattressNextDay kids foam mattress?
It's rated firm, with an orthopaedic-style EcoFoam® surface. That's generally a good thing for growing children who benefit from even, supportive sleep, although kids used to a softer feel may need a little time to adjust.
What sizes does the MattressNextDay kids waterproof mattress come in?
It's available in UK Single only. The mattress is 14cm deep, a sensible height for children's beds, bunk beds and cabin beds, though always check your bed frame's maximum mattress depth for bunks.
Does the MattressNextDay kids mattress have a guarantee?
Yes, it comes with a 5-year guarantee. It's also made in the UK by an NBF-approved manufacturer and meets the BS 7177 domestic flammability standard with Source 5 fire retardancy.
Is the MattressNextDay kids waterproof mattress good for allergies?
It should help. The EcoFoam® core is naturally dust mite resistant and the mattress is certified hypoallergenic, and being able to machine-wash the cover means you can keep the sleep surface genuinely clean, which matters for children with allergies.
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