Insect mesh, also known as insect screen or bug screen, is a type of material that is used to prevent insects from entering a building or a screened-in area. It is usually made of a finely woven mesh of nylon or fiberglass and is installed in windows, doors, and other openings in a building. Insect mesh can be purchased in pre-made panels or in rolls that can be cut to size and installed as needed. It is also available in different colors and with varying levels of transparency to allow for varying degrees of visibility and light transmission.