śhuchau deśhe pratiṣhṭhāpya sthiram āsanam ātmanaḥ
nātyuchchhritaṁ nāti-nīchaṁ chailājina-kuśhottaram||11||

Meaning : Let the yogi prepare a firm seat in a clean, quiet place for meditation. The seat should be neither too high nor too low. It should be made using a cloth, deerskin, and sacred grass (kuśa) layered in that order.