Actually, an inmate a couple of posts above got his ADV GoreTex for only US$22.00 more than the ADV Rain. The difference? Well, GoreTex for starters, then they also come with GoreTex's "guaranteed to keep you dry" promise, if your boots leak, they fix them or send you a new pair, also the GoreTex model is made with real leather, the "rain" model is made with a synthetic... So, yeah. There are a few differences.