There are many types of fabrics used for advertising umbrellas, but the three main types are:
1. Polyester: This fabric has little elasticity; once wrinkled by hand, it is difficult to restore its original shape.
2. Nylon: This fabric is relatively elastic and feels smooth to the touch. Sprinkle some water on it, and with a gentle shake, the water will immediately roll off.
3. PG fabric (also known as PVC fabric, PVC-coated fabric, etc.): This fabric feels similar to cotton to the touch and has a softer sheen.