Our 6 mil plastic film for greenhouses is designed specifically for inexpensive greenhouse use Slightly opaque Tufflite InfraRed Plastic reduces light transmittance and diffuses the light Good choice for hotter locations or when growing more heat-sensitive plants like lettuces For shipping weight, figure 0.5 lb/linear foot Not to be confused with construction-grade poly which yellows quickly, reducing light to plants and deteriorating within only a few months. This material lasts 4 years against UV degradation.Also available as SEG120 and SEG100 in 5' increments only, with a 10' minimum order..For a clear greenhouse poly, see the Tufflite IV Clear Plastic which provides light transmission comparable to glass, even when used in double layers.Note: picture shows the 6 mil Clear Plastic.