A sail is any type of surface intended to move a vessel, vehicle or rotor by being placed in the wind. It is in essence a wing used for propulsion. Sails are can be made from various materials and strengthened using specific liquid mixtures.
Source materials
Any type of natural material also used to make textile can be used, knowingly: cotton, wool, kashmere, hemp, sisal, silk, kenaf, jute, ramie, linen, lyocell