The leg portion of the boot is fitted with the TECNO VR closing system patented by Sidi, to provide a micro adjustment via a nylon thread passing through two lateral holes. The mechanisim pulls on the thread to wrap the boot symmetrically and snugly around the calf.

For a greater foot safety the heel of the vertigo model is fitted with a transparent polycarbonate shell with anti-impact shock absorbers.

On the lower outer part of the boot an air intake is fitted which can be opened and closed according to needs, by a simple pushbutton.