The fabric made by applying moisture, pressure, and heat to wool is called felt. Felt is a non-woven fabric that is dense and highly durable. It is made by compressing wool fibers together, which interlock and mat together to form a solid fabric. The process of making felt has been known for thousands of years and was used by nomadic people to create tents, clothing, and other items. Today, felt is used for a variety of applications, including hats, shoes, and crafts. It can be made in a wide range of colors and thicknesses, depending on the desired use. Felt is also easy to work with, making it a popular choice for DIY projects.