Built by our guide team for all-season, high-output activities from alpine and rock climbing to trail running and cross training. Ultralight FLEXion™ four-way stretch performance shell of nylon/spandex/polyester offers superior flexibility and breathability, and is wind- and water-resistant. StormRepel® durable water-repellent (DWR) finish beads water so it doesn't soak into the fabric. Streamlined design eliminates bulk while allowing full range of motion.