soles of boots there is no difficulty.
Take old boots( do insoles from new boots does not make any economic sense) and a removable insole appropriate size of the other shoe.
Cut bootleg valenki from the bottom and cut it along the length of the longitudinal fold line into two halves.
Putting insole on one of the halves, drag a marker contour insoles and cut with scissors or a very sharp knife, if the boots will be thick.
To produce the second insole, do the same, turning to the other side of the insole, so as not to get two left or two right insoles.
Advantages of self-production of insoles valenki are obvious:
In addition, the remainder of the boots can be used as slippers, especially if the house is cold floors.