Tanned skins, also known as leathers, are animal hides that have been treated with chemicals and tanned to make them more durable and resistant to decay. The process of tanning involves soaking the hides in a solution of water, salt, and other chemicals, then drying them in the sun or in a smokehouse. The result is a strong, flexible material that can be used for a variety of purposes, such as clothing, furniture, and accessories.