Southwire 1639SW61 made to perform in extreme conditions, the Polar/Solar supreme extension cord is made with an exclusive T*Prene insulation jacket. T*Prene is formulated to offer superior jobsite performance in extremely cold weather. The Polar/Solar supreme extension cord is abrasion, chemical and oil resistant for survival in the toughest of environments. Polar/Solar Supreme extension cords are rated from 221 degrees Fahrenheit to -76 degrees Celsius.