A fly refers to the outer layer of a tent or to a piece of material which is strung up using rope as a minimalist, stand-alone shelter. In basic terms, a fly is a tent without walls. Purpose-made stand-alone flies are also sometimes referred to as bivouacs, bivvies, tarpaulins, or hootchies.

Do I need a rain fly for my tent?

The answer really depends on the weather. It is necessary to use the provided rainfly if it starts to rain. This will prevent water from getting inside your tent and keep it dry if installed correctly. For dry and warm weather, it is recommended not to install the rainfly to allow for sufficient ventilation.

What is a tent fly made out of?

A siliconised fly is one made of fabric with a silicone coating. A tent fly can also be coated in PU (polyurethane) or PE (polyether).