The Frost King Pipe Insulation Wrap is a 1/2 inch thick foam pipe insulation designed to insulate copper, plastic PVC, ABS, and CPVC pipes. It has a split seam for easy installation and can insulate pipes from 1/4 inch to 1-1/4 inch in diameter. The R-value is 3.5 to help prevent heat loss, moisture buildup, and energy waste. This USA-made insulation wrap is mold and mildew resistant and meets ASTM E84 flame and smoke safety standards. It's an affordable way to insulate water pipes, protect against freezing, and reduce noise.