Dura-Film Super 4 offers the best value in a 6-mil, 4-year greenhouse film with the following improved properties over older generations of greenhouse coverings. Superior strength and toughness. Higher light transmission. Guaranteed longer life 4 years. Folds up to 210% stronger. Tear strength up to 164% higher. Puncture force up to 12% higher. Advanced UV up to 33% longer life.