Under Armour Fly-By Women's Stretch Mesh Running Top Superior Moisture Transport System - Wicks sweat away from the body so you remain cooler, drier, and more comfortable. Soft Stretch Mesh Fabric - Delivers amazing breathability and style. Semi-Fitted - A slimmer athletic cut that delivers better mobility by eliminating the bulk of extra fabric. Racerback Design - Unlocks mobility and is perfect for layering. Smooth Flatlock Seams - Prevent chafing no matter how hard you work.