A thicker cotton fabric or hemp fabric. Was named for the original sail. Generally use plain weave, a small amount of twill weave, warp and weft are used multi-stranded. Canvas is usually divided into two categories: canvas and fine canvas. Rough canvas, also known as canopy cloth, commonly used 58 (10 British) 4 to 7 strand thread weaving, fabric firm folding, with good waterproof performance, for car transport and open storage of the warehouse and the field tents. Fine canvas warp and weft yarn is generally 2 shares 58 to 6 shares 28 (10 British / 2 ~ 21 British / 6), for the production of labor protection clothing and supplies. After dyeing can also be used as shoes, travel bags, backpacks and other fabrics. In addition, there are rubber canvas, fire, radiation with the shield canvas, paper machine with canvas.