Non Porous Black / White Ground Covers PAK White Reflective Ground Cover is made of a two-sided white/black polyethylene. The white side of this special, two-sided fabric promotes photosynthesis by boosting illumination and helps increase plant health, growth and resistance to disease. The increased light reflected onto the underside of leaves. The fabric’s black backing stops light from reaching weeds or algae thereby inhibiting their growth. The fabric is waterproof and designed for indoor use. Characteristics: • Helps Deter Insects • UV Stabilized polyethylene • Water and air impermeable • Mildew resistant • Non porous Orders typically take about 1 - 2 weeks to ship.