Superlight full side-zip 3-Layer GORE-TEX® waterproof/breathable pants from Arc'teryx.  An excellent all around choice for many mountaineering, hiking, and backpacking trips. A great value from Arc'teryx.  The full length separating side zippers allow you to quickly and easily take these pants off and put them on while wearing things like boots, crampons, backcountry skis, and snowshoes.  Perfect for lightweight mountaineering trips.