> Hi, I am looking for a bed protector to reduce or eliminate the dust
> mites for my son. Most of them use polyurethane membrane as the
> barrier. Is polyurethane a proven safe material for long term use? We
> spend 1/3 of our time in the bed and I heard Polyurethane foam should
> be avoided for allergy people.
Consider a waterbed. The matress is impermeable and its sustained
temp is above that at which mites can survive (dehydration). Add Blue
Magic at twice the recommended rate while filling. Burp the matress
as needed. If the kid had rolled in dirt as a normal baby he would
have developed a competent immune system.

Signature
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf