Traditional curling, like you see at World Championships, is made up of single sex teams of either five men or five women. However, for traditional team curling you do not always need the fifth team member. A team consists of four athletes: the fourth, third, second and lead. They are supported by an alternate (substitute). One of the athletes will be the skip.
Instead of playing in teams of four, mixed doubles curling is for teams of two players – one male and one female (no alternate/substitute player is allowed). - The game is played on the same sheets of ice as “traditional” curling.