CLASSIC FX liners are an excellent upgrade solution to cold feet in winter boots and Mukluks. Not intended to be a high performance liner, these super soft, low-density, medium thickness wrap style liners will provide maximum warmth and comfort every day.

The Classic FX is a medium volume liner and works best with a shell fit* of One – two fingers (1/2″-1¼”)

If your shell is a half size, round up for this model

This model can be worn ‘out of the box’ or molded with the home fit kit if further customization is desired.

 

Checking Shell Fit*

In order to determine the right thickness of liner for you, start by checking your shell fit. To do this, pull the existing liner out of the shell. Stand with your bare foot inside the bare shell, and move your foot all the way forward so that your toes are touching the end. Bend your knee and flex forward a bit so that you can slide your hand or even a pencil into the shell behind your leg. How many fingers can you fit between your heel and the shell?