Canvas is a relatively thick and thick fabric.
Generally, canvas is divided into two categories, one is coarse canvas and the other is fine canvas.
Rough canvas is also called tarpaulin, tarpaulin. Because the fabric woven from this type of canvas is strong, strong, fold resistant, and has relatively good waterproof performance. It is often used by us for transportation and covering in open warehouses. This is also the origin of the name tarpaulin, tarpaulin. We used rough canvas for the tents in the wild. The first widespread use of canvas was to use coarse canvas for marching tents.
Fine canvas is generally used as protective clothing for labor. It is also widely used in shoes and backpacks. The liberation shoes that were popular in China were made of fine canvas.