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 needs to be the same. Next, determine the pants’ length. If your pants’ length is size 28 to 32, your lining’s length should be size S. If your pants’ length is size 33 to 36, your lining’s length should be size L.

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

Read more about sizing here.