ProPart shrink tubing is a flexible, double-walled heat shrink tubing with an integrated melt adhesive designed for a lasting waterproofing insulation in wide variety of applications. It has an unique inner wall which melts when heated and penetrates into any gap or slot by the shrinking of the outer wall. After cooling, the whole exhibits a smooth and strong closed casing with uniform wall thickness. It is made from radiation cross-linked polyolefins. It shrinks to 1/3 of its supplied diameter. Some dimensions are suitable for the most requested already of irregular shapes in a wide range of applications.