Corde Lisse moves are normally a combination of held postures and drops using ropes normally made from soft cotton about 25-30mm thick. It is closely related to both silks, another aerial circus skill performed on one or two long strips of strong fabric, often in bright colors. It requires great skill and strength. Performers do not have any kind of safety net or safety line, relying on their own strength and ability to prevent a fall. It is also possible for two people to perform on the same rope, although more than two is very rare. These people can either hang off each other, or both be at different heights on the rope itself. The most famous use of aerial Cirque du Soleil also use corde lisse, silks and trapeze in their shows.