If you are trying to get a better fit follow the instructions below.
Depending on the liners most of our boot models are heat moldable. This can be done at any official reseller who has a Therm-ic heat molding unit.
We do not suggest heat molding our liners without using the correct tools, but these are the heating times/temps of the Therm-ic heaters we have:
100 C / 212 F @ 15 minutes heating time
120 C / 248 F @ 10 minutes heating time
Simply riding your boots for a few times will give you a better fit than the out of the box fit. The heat from your feet causes the boots to mold/ break in.