Abstract: Disclosed is an adhesive product useful to protect elongate material, for example, leads and cable harnesses, from ambient heat. The adhesive product has the form generally of a tube when expanded, or of a tape when flattened. The adhesive product has an outer surface and an inner surface, the inner surface defining a cylindrical interior space when the adhesive product is expanded, and, for all practical purposes, being non-existent when the adhesive product is fully flattened. The outer surface of the adhesive product is heat-reflective, and the inner surface is abrasion-resistant. In this embodiment, the cylindrical interior space is empty yet fillable. Also disclosed is a method of protecting an elongate material in need of protecting from ambient heat. The method comprises sliding the inventive adhesive product over said elongate material.