An ordinary, everyday dust mask you wear over your mouth and nose, secured by a rubberband? 
Yes, that would be my guess as to what they're referring.  I could be wrong, I found it difficult to concentrate with all the babe-o-licious pics over there!  <img src="images/graemlins/laugh.gif" alt="" />  Make sure you get the 'R95' type if you're going to bother with it at all.