The Argali Selway 6P Half Liner fits inside the Selway 6P Tent to provide double wall coverage inside the tent to prevent condensation from dripping on you or your gear. Liners are made from 20D nano-ripstop polyester fabric and coated with a PFC-free DWR coating. Liners are helpful if you are sleeping in wet weather, late season or you plan to use a stove (which can cause condensation). For full condensation protection, purchase two half liners.