Berry Plastics Tufflite IV 6 mil 4 yr UV Protected Greenhouse Film 40 ft x 100 ftStore pickup only These Greenhouse Films covers all your needs whether it is for single season, full year or 4 year protection. Tufflite brand Greenhouse Film is a tri layer polyethylene film for maximum protection and ease of installation. All Tufflite products offer high clarity to allow the most light possible. This film is UV protected and has a 6 mil thickness for strength.