Orcas plastic microfiber structure effectively scatters light from highly reflective crystaline structures within the substrate. Orca Grow film is 94% reflective accross the full visible spectrum and provides 99% diffusion. Orca Grow film is 100% light tight, thermally reflecting, waterproof, and will not yellow from UV light. Orca is 11 mil. thick, extremely durable, tear and puncture resistant.