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Expected ambient air temperature? Is exposed skin an issue?
Color- Are frames that aren't white going to impact your overall color scheme in relation to the rest of the gear you are carrying/wearing?
"Glasses" (sun glasses especially in snow with sunshine) Fogging can be an issue with glasses if you have a Balaclava on but in more moderate temperatures are easier to work with and do not limit peripheral vision.
Goggles - Glacier goggles or ski goggles are a better choice if the environment requires it.
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"There are more instances of the abridgment of freedom of the people by gradual and silent encroachments of those in power than by violent and sudden usurpations"
James Madison
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