Featuring patented GreenHeat Technology, the Powerblanket Multi-Duty heating blanket uniformly distributes an insulated barrier of heat while consuming low levels of energy. It provides an environmentally friendly solution for protecting construction materials and machinery from freezing, curing concrete and thawing frozen ground. The blankets are offered in several standard sizes ranging from 2- x -2 ft. to 11- x -23 ft., and custom sizes are available by request. Standard blankets are rated to -10 degrees F/-23 degrees C while Arctic versions are rated to perform in temperatures as low as -40 degrees F/-40 degrees C. Built with a durable outer shell that is winter-proof and water resistant, blankets are powered by 120V electricity, thereby eliminating the open flames and hazardous waste associated with common heating products, according to the manufacturer. Non-horizontal versions of the blankets are certified to UL/CSA/ETL safety standards.