What is the best kind of mattress for a 6 year old?

[marykat2004]

What is the best kind of mattress for a 6 year old? (with no health problems)

In the shop DH and liked the foam mattress but is that too firm for a child? Does it matter at that age? We always had old saggy mattresses when I was a kid. DD's toddler bed was second hand and also very saggy and springy.

Any advice appreciated.

Thanks

we got an airsprung comfort mattress from argos although they dont seem to sell them any more - it is a medium/firm one.

It was this one