Abstract: A piping jacket for insulating a piping element to prevent heat transfer and to protect the piping element from moisture and other elements. The piping jacket has a first edge portion with a curved edge and a second edge portion with a plurality of projections that interfere with the curved edge to secure the piping jacket around a piping element when the piping jacket is in a closed position. The piping jacket can have two or more rows of projections along the second edge portion to accommodate piping elements having different outer diameters. The piping jacket can also be formed by two separate body sections positioned around a piping element and pressed together so that projections along a first edge portion and a second edge portion of the inner body section interfere with the curved edges of a first edge portion and a second edge portion of the outer body section.