laterally opening seat 21 configured so as to removably insert the box like structure 11 also in this case there being provided inside said seat suitable sockets for the connection to the circuit 8 of the device 1 fig6 instead illustrates a ski boot 2 having the front quarter 17 with a seat 21 upwardly open and configured so as to removably accommodate and surround the box like structure 11 so as to protect it from possible shocks during skiing naturally the control knob 12 for the potentiometer as well as the control lights 14 and 53 are positioned so as to be visible and accessible by the user fig7 illustrates a ski boot having the container 20 at a rear portion of the quarter 19 in said embodiment the seat 21 opening towards the interior of the boot 2 a recess is thus defined which is adapted to allow the removable insertion of the box like structure 11 within said seat 21 there protruding present terminals 22 adapted to allow electrical connection to the pins 13 fig8 illustrates a ski boot 2 on the upper region of the shell 23 thereof adjacent to the front quarter 17 there being provided a seat 16 on which is removably placed a box like structure 11 provided with sockets for the connection to the heating circuit 8 shaped complementarily with respect to preset pins 24 provided and projecting from said seat 16 fig9 illustrates a ski boot 2 on the upper region of the shell 23 whereof adjacent to the front quarter 17 is provided instead a seat 21 adapted to accommodate the box like structure 11 the same being protected within said.