Eco-Conscious Materials for Ultimate Freedom of Movement The Echo Tank utilizes our customer-favorite Echo materials to create an airy, breathable layer for hot days spent hiking, trail running, or climbing in the sun. Ultralight, stretchy fabrics and an updated fit complement the body's natural movements during reachy moves at the crag or pushing the pace on a trail run. UPF 15 protects from UV rays, while the AirVent™ fabric provides superb airflow and breathability. The racerback styling and drop-tail hem are styled for airy freedom of movement, and the flat-seam construction ensures a comfortable fit whether wearing this ultra-comfortable top alone or layered under your favorite flannel or fleece. Available in a wide assortment of colors, the Echo Tank is a versatile, high-performance tank for warm weather or high-tempo indoor activity where staying cool and freedom of movement are top priorities.