The material that houses cables is just as important as the cables are themselves.  The housing of cables is there so that nothing is able to harm or interfere with them.  The housings that are usually used to protect these cables are called innerducts.

Innerducts can come in a variety of colors but are known for being made in a bright orange shade.  The tube is typically light weight and flexible, aiding in the installation of them because they are installed in restrained areas.  Innerducts surround fiber optic cables, and sometimes other types of cables or wiring, that are being run underground.