Totally bomb-proof. I use them 20 to 25 days this past winter for both skiing and playing in the snow. I really can't see these every wearing out at my rate of use. High value pants. Expensive but worth it. Fit is more slender than other pants by patagonia. easy to glide them on and off. they seal out the snow and cold. Best feature is that they breathe extremely well even in very warm spring days. I questioned the light gray when buying but it works well with most any color.