I purchased this product after purchasing two other masks that had problems with fogging, scratching, and falling apart. When I received this mask and put it on, it was amazing how comfortable it was. This mask has a thermal lens so it can't fog. The lens also is scratch resistant and it hasn't scratched at all.
-Very comfortable, Sits on my face very well. Very Stable when running, my old masks moved to and fro when I ran.
-Has a thermal lens. No more fogging!!
-The lens is very large which provides a very large point of view.
-Anti scratch lens
-For me, there is a slight glare when looking at lights.
Besides the glare when looking at lights I have not had any problems with this mask.
Rating: [5 of 5 Stars!]