The Skiing locomotion is a hand locomotion; a Skier can be enabled on each hand of the player via locomotions cycling. As with any other hand locomotion, this must be done for each hand for which you want its locomotion to become active.
Skiing controls the friction of the player body. By toggling to a lower friction, the player glides easily across terrain.
Skiing works well with another locomotion in tandem. All locomotions are compatible. Skiing has been tested to pair well with both Boosting and Treading for example. There's a lot of room for experimentation here. What would happen if skiing was combined with the Flipping locomotion?