Hi cath07,
The link you posted (I removed the link) leads to a web hosting site. If you could you add a link to the actual mattresses you are describing (and if they provide the details of the actual quality of the material instead of just listing the type of material) Iād be happy to give you my thoughts about them 
In the meantime ā¦ my reply to another forum member from yesterday in post #2 here has some information and links to other Australia threads that may be helpful to you.
Phoenix