How do you dress for extreme cold weather?
8 January 2014 Last updated at 00:39 GMT
Eric Stern from Casual Adventure talks to the BBC's Beth McLeod about preparing for the extreme cold weather that has been hitting parts of the US and Canada.
About half of the US population has been placed under a wind chill warning or cold weather advisory.
In Toronto, the temperature dropped to -24C (-11F) before dawn on Tuesday.