Panda Film 730090 Panda Poly Film, 25 ft, Brown/A Used in growing areas - this is waterproof poly film that is black on one side and white on the other. Panda Film works well as a reflective film (reflects 90% of the light back to the growing area) or as a room partition. This is a very heavy duty film at a thickness of 5.5 - 6 mil.