An innerduct is flexible cover that houses cables to protect them from anything that could harm them or tamper with them. The innerduct usually surrounds fiber optic cables that are to be run underground. They can also be run in air-handling spaces either horizontally or vertically.

These innerduct are usually orange in color but can sometimes come in multiple shades. They are typically very lightweight and extremely flexible, which is a plus during the installation process. The small amount of weight and the flexibility of the innerduct permits for them to be installed in small or confined areas.