Quality construction and materials
To put it right up front: I did not wind up going with this mask, since the chin piece did not fit me properly.  However, nothing about that is an issue with the mask; the mask is well made and clearly a quality piece of work.  I really regretted that the chin did not fit properly, because I would have liked to wear it.  In the limited testing I could do, I did not see any problem with fogging.<br /><br />In addition to my good impressions of the mask, the seller is also wonderful to deal with.  They responded quickly, and the return process was absolutely painless.  Not only that, but they have offered to work with me to help me get a mask that does fit me.  I am happy to do business with this seller.
Rating: 5 stars