Weed control mat works fine on its own, but it's usually best to cover it with a decorative mulch, rock, or other ground cover. The weed mat ground cover separates the cover material from the soil
Weed mats need to be thick enough to be able to prevent light from reaching the soil. Even the slightest sliver of light can start germination, which will cause weeds to grow.
Anti-insect screens protects plants by exclusion. Some nettings can also contain additives that help to increase their effectiveness against pests. Newer types of mesh netting can include optical additives such as aluminum strips for light reflection.