A thicker cotton or linen fabric. Named after its original use for sails. In general, plain weaves are used, and a small number of twill weaves are used. The warp and weft yarns use multiple strands. Canvas is usually divided into rough canvas and fine canvas. Crude canvas, also known as canopy cover cloth, commonly used 58 (10 British) 4 to 7 strands of fabric, fabric fastness, with good water resistance, used for car transport and open storage warehouse cover and wild tents. Fine canvas warp and weft yarns generally consist of 2 strands of 58 to 6 strands of 28 (10 British / 2 to 21 British / 6) for the production of protective garments and their products. After dyeing can also be used as shoes, travel bags, backpacks and other fabrics. In addition, there are rubber canvas, fireproof, radiation shielding canvas, paper machine canvas.