The Echo L/S Tee is built from bluesign-approved and recycled materials and is perfect for everything from fall running and spring ski touring to summer hiking and winter base layers. The lightweight and breathable fabric is infused with UPF 15 sun protection and ActiveFresh odor control technology, and the AirVent technology provides superb airflow and moisture management. The Echo L/S Tee features a reflective logo, quick-drying fabric, and flat-seam construction for a comfortable fit. Truly an all-arounder and an OR customer favorite, the Echo L/S Tee is the do-it-all piece for 4-season use.