Great cloth, having great glasses for running and cycling with any coloured lense, got the cloth. Was stunned to run with fog free lenses, even when it's freezing!
Too bad the equipment is hard to get in the Netherlands, so I have to ship it in.

If you're tired of saying that to your buddies as they jump in and poach your line because you're fumbling with your fogged up goggles, get the No Fog cloth. As I wear glasses and OTG goggles when skiing, I keep the cloth handy in my pack and use it everyday before heading out. Keeps everything nice and clear. Cheers.

I've used no fog cloths for years both on my snowboard goggles and on my sunglasses while on my road bike. They're the best $2 investment you can make. I haven't had any fogging issues since using them.

After a long search for an acceptable anti-fogging product, I think I've finally found one. I play airsoft, which usually takes place on very hot & humid summer days (Northern Illinois climate)...I've had a bad time trying to keep my safety glasses & goggles from fogging up on days there's no breeze.

I've used the Smith No Fog Cloth for two events now and I haven't fogged up once. If that's any indication, my search for a good anti-fog product has come to an end.

(Note - keep in mind this review is based on use in hot summer-like conditions, not on a ski slope or any other cold-weather situation)