The tipi liner is an interior cloth wall that insulates and controls airflow in the tipi. A tipi cover alone provides sufficient mild weather shelter but in cool or hot weather a liner is essential. A properly pitched tipi cover is staked a few inches off the ground. The liner hangs from the inside of the poles and extends onto the ground, sealing the bottom of the lodge. Cool outside air is drawn under the cover and channels up through the smoke flaps, taking the smoke out with it.