Creates an instant closeable access door in tarps or plastic sheeting. For interior or exterior use. Ideal for dust walls, vapor barriers, boat covers and green houses. Works in extreme heat and freezing temperatures. Perfect for all types of construction. Prevents heat loss, stops dust and reduces migration of moisture. Installs in minutes. Made out of heavy duty 950 denier polyWorks in temperatures of minus 20 degree to 150 degree FahrenheitZipper door is UV resistantOpens from either side