The best headgear for freezing days (and nights) - the BALACLAVA, also known as ski mask, monkey caps or Roger-Staub-caps... They cover the whole head, exposing only the eyes and mouth, and can easily be rolled up into a normal hat.
The name BALACLAVA comes from the town of Balaklava, near Sevastopol in Crimea, Ukraine. During the Crimean War (1853-1856), knitted balaclavas were sent over to the British troops to help protect them from the bitter cold weather.
Here the model in olive!