Paula Vaz-Carreiro (asker) Dec 6, 2011:

To Luiza Thanks for your latest suggestion (colchonete) because it helped me find what I think is the most appropriate PT_PT term, 'colchão de sobreposição'.
If you want to withdraw your answer and put up a new one with these two terms (colchonete' and 'colchão de sobreposição'), I'll be very glad to award you the points. Thanks a lot.

Luiza Modesto Dec 5, 2011:

Paula, I'm sorry, now I got you. In Brazil they seem to be called either colchonete or "pillow top." Check out this site: http://www.kenkopremium.com.br/colchonetes/colchonete-magnet... and this one: http://www.emporiodolencol.com.br/ecommerce_site/produto_146...

Paula Vaz-Carreiro (asker) Dec 4, 2011:

I'm sorry Luiza, maybe I still didn't explain well enough. It isn't just a protecting cover, it is like and additional mattress. Please see this additional link.

http://www.overstock.com/Bedding-Bath/Serta-Memory-Foam-3-in...

Luiza Modesto Dec 4, 2011:

I mean protetor de colchão.

Luiza Modesto Dec 4, 2011:

That is exactly what a proteção de colchão is. Have you seen the links?

Paula Vaz-Carreiro (asker) Dec 4, 2011:

Thanks Luiza for the answer, but I don't think this is quite the same. A mattress topper, is like a thin mattress that goes over your existing mattress. My link shows several different types of mattress toppers; they can be made of memory foam, latex, and even feathers.