Well, what to say, as always requires refinement. The elastic is not rigid, stretches well and even fixing the knot at a height of 180 cm, it was not comfortable enough to feel. The solution was simple: instead of a regular rubber band took a regular rubber band with hooks bought in the aurora store chain. You can also take an elastic band from a manual expander. I tried only 1 time, but the result is written after 2 weeks of regular use... Let's see.