This is the second pair I have tried , first thing is they are the most comfortable googles, the foam is soft and con forms well.
They work great in the cold. seen these used on a Everest expedition so I tried them out and wow they are amazing , if your in the bitter cold you dont want to take of your googles and expose your fingers so these are perfect for that ! fan has a low and high speed! really sucks out the fog , lenses are super nice as well.

I use these goggles for eye protection for outdoor winter work, like snow blowing & wood chopping. I've tried several other brands of industrial work goggles, tactical goggles, & snow goggles, all claiming to be "fog-free." In reality, this is the only pair I've found that actually stays fog-free after more than a few minutes of work. And they do fit over my eyeglasses. I wish I had found these sooner, because I've wasted far more money on past goggles that fogged up than I spent on these.

Any one who has problems with fogging these are a must have.
I have used them in the backcountry , and resort skiing, they have always performed.
They are large on your face, but who cares how you look when your working for first tracks.

I got these straight from smith after having fogging problems with the regular prodigys. I have taken my share of diggers and headers this season and the fan seems like it has developed a type of short. The fan runs slower, even on high, and sometimes would just stop. They did work before they "shorted". I have never had a pair of goggles that would not fog and the turbo fan worked when it was working right. Guess they are no that durable

I got these after my I/O's fogged up consistently, ruining a day at Alta. I sweat a bit in all conditions, so I think that led to it. Got these, they took care of that problem.

The good: no fog ever, good fit for my huge melon, mirrored lens works well.

The bad: lenses scratch easily, expensive, if fan breaks you're back to square one, you can hear the fan even on low.

These goggles worked great until I was eaten by a back country snow drift that sank me over my head. After that, the fan never worked again, which is not the worst thing. Getting the POWDER out with my hand, just like I had done frequently with an older, cheap pair of goggles, left these Smiths unusable - totally scratched up over half the lens where I had picked out little slush chunks.

I have used the Smith turbo goggles with eye glasses for several years and they work great. Make sure they fit over your eye glasses. Also make sure the air inlet at the top of the goggle is not blocked by your hat or helmet (I cut out a small notch in my helmet to improve the air flow)

Well, in case you were wondering the turbo fan really does work! I am an ex-college o-lineman, so needles to say I work up a real sweat on the Mt. and I had some problems with other goggles fogging up (even ones with vents) so I bought these hoping they would keep the fog at bay, and they most definitly do, even on a 50 degree blubird day at Kirkwood last January, no fog! They are sized to fit bigger faces and work awesome with my helmet.

skiied them 2 days under the snowguns of northeast the lense scratched. Called Smith and they were no hope and lenses are not under warranty pretty much under any circumstances. Unfortunetely Smith Goggles don't hold the same standards of the sunglasses. At least, Oakley, Bolle, Spy are customer service friendly.