I can't find any full insulated shoe covers large enough to fit my gargantuan US size 13 MTB shoes that don't cost more than the damn shoes themselves. I tried some last winter, but they didn't really help, and they ripped after just a few uses. I also had to perform extreme modification to the shoes themselves to make the covers fit (completely removed the plastic sole lugs underneath the heel area), and even after that, getting them on and off was a workout in and of itself, with me breaking a sweat just trying to get them on over the shoes.