The Mammut Alto Light HS Pant comes along in our pack for weeklong backpacking trips with rain in the forecast or day hikes in the mountains when conditions can quickly change. The easily packable pants are lightweight and stretchy, allowing us to move quickly along forested trails and windswept ridges. The DRYtechnology treatment blocks out wind and rain, so we can be prepared for any shifts in the weather. The elastic waistband stays comfortable as we scramble up boulder fields, and as the skies clear, we can quickly change into something less protective thanks to the full-length side zippers.