You might keep the sunscreen. You can get really badly sunburned in winter and not even notice the sun even through overcast sky. Something to add, or atleast make sure you have is sunglasses. Lucky me, I've never had snowblindness, but I hear is sucks. Polarizing is best.
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A gentleman should always be able to break his fast in the manner of a gentleman where so ever he may find himself.--Good Omens