Jay Be Simply Kids Waterproof Anti-Microbial Foam Free Sprung Mattress
Mattress
Jay Be Simply Kids Waterproof Anti-Microbial Foam Free Sprung Mattress
Size
Firmness
Construction
Depth (cm)
Layers
4
Layer Details
- Waterproof fabric. A waterproof outer fabric with anti-bacterial, anti-microbial and anti-fungal protection, which means spills and accidents stay on the surface rather than reaching the layers below. That makes it far easier to keep hygienic through the messier years.
- Comfort layers. Entirely foam-free, using breathable e-Fibre comfort layers with open-cell fibres that help wick away moisture. In practice, that means a cooler, fresher sleeping surface for your child.
- Spring core. A medium firmness spring core that provides evenly distributed support across the mattress. This is a sensible feel for growing children, neither too soft nor too hard.
- 3D Mesh border. A 3D mesh border vent around the side of the mattress increases airflow. Combined with the breathable comfort layers, it helps the mattress stay ventilated.
Layer details from jaybe.com product page, September 2026.
- Room for a growing teenager: At 30cm wider than the UK single, it suits a child who has outgrown their first bed without stepping up to full double width.
- Fits rooms a double would crowd: The 120cm width leaves more floor space in a box room or loft bedroom, so the door still clears and there's room to play.
- Waterproof cover at every age: Accidents don't stop at toddlerhood, and the wipe-clean waterproof fabric means the extra sleeping surface stays protected through the messier years.
- Even support across the wider surface: The medium firmness spring core distributes support evenly, so a child who moves around at night gets the same feel edge to edge.
- Standard 4ft bedding: Small double is a standard UK size, so fitted sheets and frames are easy to find when you're replacing the bed itself.
This size suits you if...
Your child has outgrown a UK single and you want a bed that lasts through the teenage years, your child's bedroom can take a 120cm width but a full double would swallow it, or you're kitting out a second bedroom that a child uses most nights and want the waterproof cover as insurance.
Consider another size if...
You're buying for a younger child in a genuinely small room, or the space is under our suggested 2.4m x 2.8m minimum. The UK single would suit you better; it's 30cm narrower, and we suggest at least 2.1m x 2.8m for it.
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.
What room size do I need for the Jay Be Simply Kids in a UK small double?
We suggest a room of at least 2.4m x 2.8m. That allows space to walk around the bed and open drawers or a wardrobe. If your child's room is tighter than that, the UK single is the safer pick, and we suggest at least 2.1m x 2.8m for that size.
Is a small double too big for a child?
Not usually, provided the room can take it. The 120cm width gives a child or teenager real space to spread out, and the medium spring core supports them evenly wherever they end up. For younger children in smaller rooms, the UK single often makes more practical sense.
Will the Jay Be Simply Kids small double last into the teenage years?
The size will. At 120 x 190cm it comfortably fits most teenagers, so you're unlikely to need another size upgrade before adulthood. The mattress itself is designed for children rather than adults, though, so a heavier older teenager may eventually want something built for grown-up use.
What bedding fits this size of the Jay Be Simply Kids?
Small double, sometimes sold as 4ft, fitted sheets are the right match for the 120 x 190cm surface. It's a standard UK size, so bedding is easy to find on the high street, with slightly less choice than single or double ranges.
How much bigger is the small double than the single version?
The UK small double is 30cm wider than the UK single, and the two are exactly the same length. In practice that means noticeably more elbow room for a restless sleeper, without the bed taking up any more of the room front to back.