The On Active-T Breathe is crafted to be versatile and comfortable, no matter how you move. On cut the Active-T Breathe from a soft-touch fabric derived from eucalyptus wood fibers called lyocell. The fibers ensure the shirt holds its shape for premium performance and style, and it helps balance body temperature and wicks moisture. With a back cutout that gives you breezy comfort, the On Active-T Breathe is your the workout shirt yoursquoll reach for every day.