The Jay-Be Dual Support e-Pocket Mattress is the Dual Support model I'd put under a child every night: two layers of pocket springs, no open coil and no foam, in a medium feel at 20cm deep. The catch is the length. Owners keep reporting that it measures short of a standard single once it has expanded, so measure it on the day it arrives. Don't buy it for a top bunk without checking the bed's maximum mattress depth first.
Pocket springs on pocket springs, with fibre instead of foam
The support comes from a deep layer of Jay-Be's e-Pocket springs, each spring in its own pocket, with a thinner layer of micro e-Pocket springs above it for comfort. On top are fibre comfort layers and a soft knitted cover, with a 3D spacer fabric border round the sides to let air through. Jay-Be rates it Medium.
Two layers of pocket springs is a good build for your child. Each spring moves on its own, so the mattress follows a growing body without a dip forming in one place, and if your child fidgets, the whole bed doesn't rock. A medium feel suits most children: supportive and flat without being hard. If I were buying from this range for a child's everyday bed, this is the one I'd buy, once I'd measured it.
The listing calls the materials hypoallergenic, but names no certification. If allergies are the worry, a hot wash for the bedding and regular airing of the mattress will do more than the label.
Check the length before your child sleeps on it
The complaint that comes up most from owners is size. They report the mattress measuring short of the frame after unpacking, which would leave you with a gap at the foot of your child's bed, and one ended up filling the gap at one end with cushions.
A child's mattress has to fit the frame with no gap. Measure yours once it has fully expanded, before your child's first night on it, and if it's short, return it. Don't fill the space with cushions or a rolled towel. The owners who got a full-length one mostly like it, including one parent whose son is big for his age, so this reads as a sizing problem, and the comfort reports are good.
A first proper single, but not a top bunk
Buy it if your child is moving into a first proper single bed, or if your older child needs more support than a basic fibre mattress gives. It's one-sided, so rotate it every few months instead of flipping it, and you'll keep the springs wearing evenly.
Avoid it for your top bunk unless the bunk is marked for a 20cm mattress. The mattress must sit below the line marked on the bed so the guard rail still works, and on a top bunk a thinner mattress is the right one.
What to buy instead
For a top bunk, buy the Jay-Be Graffiti Art e-Pocket, which is 14cm deep and made for Bensons' bunk beds. For a child who sleeps hot, the Dual Support Natural e-Pocket keeps these springs and adds wool. I'd skip the Dual Support e-Sprung, which swaps the deep pocket springs for an open coil.
