Before use, apply the stretching spray to the area of the boot to be treated: it softens and prepares the leather, making stretching easier. Place the boot on the machine, centring it well, and choose the point to work on: shaft, calf or instep. To work on the instep, use the instep raiser supplied. For wide boots, fit the shaft extension. Switch on the heating and widen gradually until you feel slight tension on the material, without forcing, as excessive stretching could damage the boot. Adjust the heat intensity according to the type of leather, following the instructions supplied with the machine and taking care with synthetic materials. Leave the boot under tension for several hours, also when cold, then loosen and carefully remove it. Try it on and, if necessary, repeat the operation, increasing the stretch a little at a time. Proceed with particular care on delicate materials, such as thin leather or patent leather.