Tundra 1/2 In. Wall Semi-Slit Polyethylene Pipe Insulation Wrap, Iron Closed cell polyolefin tubing with excellent thermal insulating capabilities. Fire retardant. Will not rot or disintegrate. Eliminates freeze during the winter and reduces condensation in the summer. Use over cold and hot water systems, refrigeration and air conditioning lines, and a broad range of other insulating applications.