A good review of the UF PRO Windstopper Liner designed to work with UF PRO trousers, done by the Airsoft & Milsim News Blog (AMNB)... "Over the past years I often thought about buying the Windstopper Liner but I always came to the point saying; no, I’m fine. There’s no need for it. I have long johns they do the job if needed. After this product test, the Windstopper Liner proved me that I was wrong!