The Under Armour Women's Fly By Long Sleeve is made from a lightweight, quick-drying fabric that draws sweat away from your skin to keep you cool and dry.Mesh panels in the sides and back allow airflow across the skin to help keep the temperature down during those intense workouts.Material: Polyester/RayonFitment: Slimmer, athletic cutUnder Armour Moisture Transport System wicks sweat away from the skinLarge, open-hole performance mesh panels on side and back for superior breathabilityFlatlock princess seams prevent chafing and irritationRaglan sleeves for unrivalled mobility360 degree reflectivity provides extra safety on low-light runsSide seam zippered pocket for convenient, secure storage