Nope, way off. -10 is pussy Ohio weather anyways.
Gore Tex is but a single layer in the whole system that is these boots. Hell, My columbia winter hiking books have kept my feet warm in wind chills of -50*, these boots kick their ass, yours just suck.
These boots are made for the coldest places in the world. Beck Weathers is a name to look up. Left for dead twice on Mt Everest, he spent a night totaly exposed and unconsious. He lost his hands and most of his face to frostbite, his feet remained in pristene condition in these boots. Opening bid ia about half of retail price, you can't lose!
BTW, you're feet sweating in cold weather is NOT a good thing. You can get threnchfoot if you keep moving, frostbite if you stop. Wear less socks and for gods sake don't put anything cotton on.