Participation restrictions in World Cup:

Each federation may enter a team of 12 competitors – up to 6 women and 6 men in each MTB Orienteering World Cup event, and an unlimited number of team officials.

For mixed relay: A maximum of 4 teams of 3 riders per member federation. Each team must include at least one person of
each gender" (see special rules for MTB Orienteering WC 2013).