The new generation of thin-walled, flexible heat shrink tubes is made of cross-linked polyolefin with a 3:1 shrink ratio and packed in convenient storage containers. The main advantage is the ability to use them for shrinking on elements with a large difference in diameters. Additionally, five tubes of this type cover a range of diameters from 1.0 mm to 20.0 mm, which, when using tubes with a 2:1 shrink ratio, requires the use of 10 sizes. This allows us to significantly reduce storage costs. Basic electrical insulation, color coding, and protection against corrosion and mechanical damage are provided.