This treatment has been used on my Merrell Moab Ventilator Mid GTX boots, and my wife's Salomon Exit Sport GTX hiking shoes. I bought it specifically because Merrell and Nikwax both recommended this type of treatment for both the Gore-Tex and the mix of leather and fabric. With limited use so far, it has helped to keep water out, and beads on the surface in most cases. I'm sure it also assists in keeping the shoes from holding stains from mud, saps and dirt also, thereby keeping the shoes looking newer for a longer period of time. We have not reached the point where the waterproofing has worn off, therefore can't vouch for its longevity (reason for 4-star rating). Hopefully the Gore-Tex won't leak, but at least this creates another barrier that inhibits water from getting in, and still allows the shoes to breathe properly. So far nothing but good things to say about it. I would purchase this product again, and would recommend it if you have similar footwear, regardless if it has Gore-Tex or not.

I bought this treatment to continue the waterproofing of my mountaineering boots. This stuff works like a charm! I use a lot of Nikwax's products and they're all really good. After an application water literally beads off of whatever you are waterproofing. You wanna stay dry, use their stuff!

Looking for something to seal my shoes and boots and just keep them nicer for longer! Found it! This stuff smells a little funny, but It does a nice job of sealing shoe without changing color are creating a stiff layer that flakes.

Always use the appropriate Nixwax product on your gear. Or some other brand, I'm not shilling here. They do help to keep the water damage down, and as the other reviewer noted, the mud and stains come off easier.