Moderate - fair amount of time/handling to change lenses
Medium - prevents fogging during low-to-moderate activity
Flat - cylindrical lenses with limited field of vision
The Giro Index OTG is always a top performing goggle for anyone who is looking to enjoy the slopes, but has never been able to find a goggle that fits over their glasses. Extra Volume in the temples and extra depth create a big enough compartment for nearly any size frame. An Anti-Fog Coating and Increased Air Volume Inside the goggle will prevent fogging, so you will be seeing your best on the mountain. A Cylindrical Lens reduces distortion. Double Layer Face Foam wicks away moisture and keeps a nice seal across your face to keep the elements out. If you are looking for an easy to fit goggle with any type of frames, the Giro Index is the go-to goggle.
A: OTG means "Over The Glass" meaning the goggles have an over-sized frame meant to fit easily while wearing eyeglasses. This will fit over your helmet without issue but if you don't wear eyeglasses you may find the frame a bit large. Giro does recommend Giro goggles with their helmets and per their website this goggle offers "Seamless Compatibility with all Giro helmets"
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