Chapter 6 Lesson 7
As promised in the last 3 lessons, now will tell u what the Guru of Gurus has to say about meditation.
In chapter 6 verse 11 Lord Krishna states: ' Sit on a spot, neither very high nor very low, free from dirt and other impurities with a kusa grass below, deerskin in the middle and cloth uppermost.

My note
Darbha grass also called Kusha or Munja
Whenever a priest used darbha grass on rituals, festivals, tied them as a ring I always wondered at the significance. Was happy to read an article by Ranjeni A Singh who explained its significance.
It is a dull yellow coloured grass.
A doctor covering his hand with the darbha grass had his palm x-rayed. To his surprise he found that the grass absorbed about 60% of the radiation. Can one conclude that it can absorb negative energies from the atmosphere also?
Darbha grass is identified with Lord Vishnu and it is believed to possess the power to purify anything.
It is believed to have been produced during the cosmic churning of the ocean of milk.
Sakyamuni Buddha is believed to have sat on a mat made of darbha grass when he got enlightened under the Boddhi Tree.
The name of Kushinagara, where the Buddha was cremated, is believed to be derived from Darbha's other name Kusha.

The deerskin
Deerskin symbolizes spiritual and intellectual pre-eminence.
A deer skin is the only animal skin considered appropriate for the yogi’s meditation seat (asana) because the vibration of the deerskin is neutral and therefore conducive to peace and tranquility. However, the deer must have died a natural death. To use the skin of a deer killed for its skin is to violate the precept of ahimsa.

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http://www.dalsabzi.com/wisdom_script/bhagvad_gita.htm