The heating element in the IceStop electric heat trace cable consists of a continuous core of conductive polymer extruded between two copper bus wires. As current flows through the core, the IceStop heat trace cable regulates its own heat output in response to ambient conditions. This self-regulating feature eliminates hot spots and results in better temperature control to protect roof and gutter materials. The Raychem IceStop heat trace cable is available with a fluoropolymer outer jacket (-XT) that provides maximum abrasion, chemical, and mechanical resistance; or a polyolefin outer jacket (-X) that is more economical for less demanding applications.