If you want to ski down the mountain, you'll need to make it to the top first. Hop on Costebelle Ski Lift and enjoy the ride up.
There's a fee to visit this mountainside transportation system, which is situated in Uvernet-Fours. But there's more to see around this area than just Costebelle Ski Lift. La Chaup Gondola, La Chaup Ski Lift and Lac dAllos are also worth putting on your itinerary.