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Get a goggle that actually works with your glasses.

Squeezing a regular-sized goggle over your prescription eyeglasses isn't ideal, and neither is the fogging that inevitably ensues. The Knowledge OTG Turbo Fan Goggle uses a fog-eliminating, two-speed fan and Smith's 'Over-The-Glasses' large design to ensure that you see every little terrain flaw, drop-off, and fellow snow-slider with reliable clarity no matter how hard you push your skills.

  • Floating foam membrane means you don't suffer pressure at your temples
  • Two-setting, micro-electronic fan on the top of the frame circulates fresh air and draws moisture out for ultimate fog reduction—run the low setting in normal conditions, then crank it to high during a backcountry tour or heavy pow-sesh
  • Carbonic-X lens with TLT Optics offers unmatched clarity thanks to the tapered top and bottom rim and impregnated anti-fog technology—less distortion and moisture build-up equals a safer day on the hill
  • Vaporator Lens Technology uses a dual-layer lens with a Porax Filter to keep the moisture out and prevent fogging
  • Urethane frame flexes with each facial movement to enhance comfort—shape seamlessly fuses with your Smith helmet
  • DriWix dual-layer face foam features a soft backing layer at the frame and a supple fleece lining against your face to absorb sweat and wick it away
  • Small battery pack on the side of the strap keeps weight near the goggle frame
  • Silicon backing keeps the adjustable, quick-clip strap stuck to your helmet or hat
  • Compatible with the ODS2 prescription corrective eyewear solution kit (sold separately)—snaps into place on the bridge of goggle frame for a seamless fit
  • Soft, microfiber bag included

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Here's what others have to say...

2 Seasons Fog Free

2 Seasons Fog Free

I've had the Knowledge OTG for 2 ski seasons and they've not disappointed me. You can hardly hear the fan, in fact a few times I've taken them off to confirm the fan is on. The only time I had a problem it was my fault for not leaving them out of the bag overnight to dry out. This caused them to fog up between lenses. I've hiked many backcountry trips here in the Wasatch Mountains and never remove my goggles. The Smith Turbo goggle models all are a huge plus when sending it on a powder day.


As advertised

  • Familiarity:I've used it once or twice and have initial impressions

I burn hot on the mountain no matter what the temps. I usually ski in a tshirt under my jacket. The fan kept the goggles from fogging up. They were bigger than I thought, and with my K2 diversion helmet, the goggles pressed down on my nostrils a bit making it a little hard to breathe. I had to adjust the helmet to make it work. I think its me; i am bald and therefore the helmet sits a little lower on me, so it pushed the goggles down further than I'd like.

They were good on a cloudy day, I wore my prescription sunglasses under them. no issues there and no wind or drafts on my eyes. the switch was east to operate even with gloves on.
Overall very happy with them so far.


Not a "fan"

  • Familiarity:I've put it through the wringer

I have the old 2-battery version that I am nursing along. Much of the foam is gone, there's some duct tape involved. But they work great.

As for the new 1-battery version, not so much. The fan is too weak, underpowered. The only way I get them to work is to stop breathing. I guess if I hadn't used the 2-battery version my expectations would be lower. Returned.

Will these fit my helmet?

I wear a Giro10 MX, size XL


Keeping The Fog Off & Visibility On

  • Familiarity:I've put it through the wringer

I've owned the Turbo Fan goggles from Smith in previous years and gotta say the new ones are so much quieter. I can sometimes totally forget that the fan is even on. Visibility is awesome and my glasses never fog up. Yea, they're a bit bigger than most goggles, but well worth it. It's not what you look like but how much you enjoy it and the OTG Turbo Fan goggles will allow a clear view of enjoyment.

Keeping The Fog Off & Visibility On

not bad but . . .

    I purchased the Knowledge OTG to try out after sending back a Smith IOX Elite Turbofan for repair.

    The Knowledge is a decent OTG fan goggle and will keep the fog off but the fan noise is noticeable, the lens is not near the quality of the IOX (or Phenom or Prophecy as I understand) and lens choice is limited if you want to swap or buy additional lenses.

    If you are looking for a standard OTG goggle that will help keep your glasses fog free - the Knowledge should do the trick. And hopefully you can find it at a deep discount. But for the same price at retail, the IOX without the fan might work just as well, and is hands down a better goggle.


    Best I've ever had.

    • Gender:Male
    • Familiarity:I've put it through the wringer

    Why I've never owned this goggle before is beyond me. For years, I've struggled with fogging glasses beneath my goggles which either forced me into being a much more cautious skier (where's the fun in that?) or just going without my glasses (blind as all hell). The turbo fan technology is great, the low speed keeps things clear and the high speed fixes things up in a snap for those heavy storm days or super warm springy ones.

    I see no need for me to EVER buy a different model of goggle. I use this in conjunction with a Smith Vantage helmet and the duo works perfectly and seamlessly together. Buy this and never worry about foggy glasses again.

    Only downside: only 1 AAA battery goes dead pretty quickly (1 week of use), my suggestion is to just carry a few extras with you and make sure to remove the battery when not in use and during the off season.

    Best I've ever had.

    Which lens did you buy this goggle with? How does it do in all the weather conditions? Especially night time?


    I have the Sensor Mirror. Overall, very good for variable light conditions, only thing is looking through two sets of lenses (glasses and goggles) just presents issues in low and flat light on its own. Not much you can do about that. As for night time, try to find a clear lens for that.

    Here's a good description of lens types/abilities:

    Hey I got these, Thanks for your review. Have you found any tricks to replacing the lenses? It took me over 30 mins and many tries to replace it the first time and have that bottom black border sit flush with the bottom lining of the goggle. The first 5 tries I saw the border in the lens and it was like double vision. Any tips?

    Try adjusting the lenses in the bathroom with the shower running on extra hot, I've been able to fix glasses this way too, just a little bit of heat and steam can do wonders for finicky frames.


    Turbo is the fog solution

    • Gender:Male
    • Familiarity:I've put it through the wringer

    I've been using the Smith Turbos for years. I don't know how many different types of crap I put on my goggle lenses to prevent or even reduce fogging, but nothing was ever good enough... until I found Smith Turbos.

    The design has improved over the years and the initial issues have been resolved. The battery pack is minimal (holds one AAA battery), stays out of the way, and is sealed. The fan noise is almost imperceptible.

    I've been out of the wettest and snowiest days and as long as I can keep my wipeouts from filling my goggles with snow, they stay fog free.


    Which lens did you buy this goggle with? How does it do in all the weather conditions? Especially night time? Thanks!


    Good goggle.

    • Gender:Male
    • Familiarity:I've used it several times

    Bought it on sale for $79.95 in local shop. Good and comfortable goggle, great vision .

    Which lens did you buy this goggle with? How does it do in all the weather conditions? Especially night time? Thanks!