The numbers are assigned based on the overall results of the 2017 ISU World Short Track Speed Skating Championships in Dutch city Rotterdam, where Seo and Christie were crowned the winners.

They will be used at the Pyeongchang 2018 Winter Olympic Games and at all ISU events, excluding the World Junior Short Track Speed Skating Championships where helmet covers will be provided.

For all skaters that did not participate in the individual races of the 2017 ISU World Short Track Speed Skating Championships, the 1,000 metres overall World Cup classification of the 2016-17 ISU Short Track Speed Skating World Cup has been taken into account.

Skaters who did not compete in any ISU Short Track World Cup competition in 2016-17 and/or in the 2017 ISU World Short Track Speed Skating Championships will receive the next available number, after the helmet numbers already assigned, the first time they participate in an ISU event during the 2017-18 season.

Such a skater will keep this assigned helmet number for the rest of the season.

The Netherlands’ Sjinkie Knegt and Canada’s Samuel Girard have been assigned the men’s number two and three helmets as the respective silver and bronze medallists at the 2017 World Championships.

Canada’s Marianne St-Gelais and South Korea’s Shim Suk-hee have been assigned the women’s equivalents.

In July of last year, the ISU confirmed short track speed skaters would be able to wear personalised helmets from the 2016-17 season.

Skaters may wear headgear with "artistic designs" thanks to the rule-change, which was first touted at the ISU Congress in Croatian city Dubrovnik last June. 

It was hoped that the move would improve the TV spectacle of short track speed skating and make the sport appeal more to a younger audience.