How do I choose the size of the WINDSTOPPER liner for my UF PRO pants?

First determine the pants’ width. Whatever it is, the liner width will be equal to it. Then determine the pants’ length. If your pants’ length is sizes 28 to 32 then your lining’s length should be size S. If your pants’ length is sizes 33 to 36, then your lining’s length should be size L.

So, if for example, your UF PRO pants measurements are 32 long by 32 wide, then the right-sized liner for you would be 32/S. Similarly, if your pants measurement is 33 long by 34 wide, then you should choose liner size 33/L.

Read more about sizing here.