Double lenses work fine (out here...humidity not a huge issue). Pro-grips double system works great. So do Smith's. Scott's turbo lens does a good job.
Washing or coating them AFTER washing with alcohol helps some.
If ANYone doesn't have quick straps already...I don't believe it!! There are actually riders that still have that ridiculous strap going all the way 'round their brain-bucket!? Man...I'd HATE that! You have GOT to get a set!!!
Not only can you detach them easily, but you can REattach the velcro with the goggles either to the rear or top of your helmet. At 'rest stops' or when you don't want 'em, they are securely positioned in a place that won't collect mud (in the back), and can be reattached with one hand (left or right, your choice depending on how you put the stickies on. Lose your clutch or throttle...pick one) easily without stopping.