Designed or treated to resist or withstand cold temperatures without damage or loss of function.
From 'cold' + 'proof' (from Old French 'prouve,' meaning tested or resistant). The 'proof' suffix became standard for materials that resist something (waterproof, fireproof).
Modern coldproof technology actually works by trapping air pockets—the same principle penguins use with their feathers—which shows how nature often figures out engineering solutions first!
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