Ready for anything, the highly versatile Kyanite performs as a midlayer or standalone across a range of activities. Delivering warmth, mobility, and moisture management, Polartec® Power Stretch® Pro allows airflow for breathable comfort and has a durable nylon face for abrasion resistance. And its brushed interior is really soft. The fabric’s four-way stretch combines with articulated patterning for exceptional freedom of movement, and the nonrestrictive, streamlined fit layers easily under a shell.