Low-Temp Smooth Clear Strip Curtain Kit - Select Your SizeLow Temp Strip Curtains are a cost effective door solution to keep cold air inside your freezer while the door is open, while allowing traffic to pass through. The flexible plastic strips can be easily parted by people and forklifts, then fall right back into place to seal off the doorway again. Low Temp Smooth Clear strips are perfect for walk in freezer doors, and the low temp material can stand up to temps as low as 40F ( 40C).