Woven fabrics are the traditional textile fabric. Fibers are first formed into yarns (threads) and the yarns are then woven together to make a woven fabric. Woven fabrics have a definite repeated weave pattern. Various weaving patterns (for example, plain weave, twill weave, etc.) increase or decrease the amount of space between yarns and affect the permeability of the fabric. A tighter weave has lower permeability and, therefore, captures fine particles more efficiently.