I've had a pair of stretch chameleons for almost 8 years now (they might be the original, it's not labeled) and they've been awesome. Sadly, I don't know if they're Gore-Tex or not because I received them as a gift and they don't have the small metal "Gore-Tex" label on the side. Either way, they're almost 100% waterproof as I've used them as my go-to winter shoe when I don't want to wear clunky boots. They've kept my feet dry through countless traipses through northern New England snow and slush, muddy hikes, total downpours in the mountains of northern Spain, and general city travel through Europe and South America. The only time my feet got wet seemed to be when I stayed submerged too long and water leaked through the seam between the sole and the upper. I'm looking for a new pair of Merrell's now (maybe the chameleon 4 GTX or the refuge pro waterproof) but only because the inside fabric of the heel has worn through to the plastic support on my old chameleon's. These don't disappoint.