evo.com | Outdoor Research Activewear Tees > The Outdoor Research Echo Long Sleeve Tee is the reliable, do-everything base layer that somehow works as hard in July as it does in January. AirVent(TM) technology and ActiveFresh(TM) odor control keep airflow and freshness in check across long days out, and the ultralight recycled fabric with UPF 15 and flat-seam construction makes it just as at home under a ski jacket as it is on a summer trail run. Quick Drying 100% Recycled Polyester bluesign(R) Approved Set-In Sleeves Ultralight | Women's Outdoor Research Echo Long Sleeve T-Shirt 2026 - X-Small Blue | Polyester