The race is 160km over three days in a harsh environment where temperatures can drop as low as -35C.
Ski boot fitting at Profeet
For a challenge like this, the team wanted to prepare as well as they possibly could, which is why they visited Profeet earlier this month.
This video shows you how they got on and you can read more on their blog.
Chemmy has visited Profeet before as part of her preparation for the event to make sure her ski boots were as good as they possibly could be.