Under Armour Heatgear Fly-By Compression Run Shorts - Women'sThe Under Armour HeatGear Fly By Compression Run Short features a compression fit that increases power and recovery time, while keeping you dry and light. The stretch mesh waistband allows great breathability, and the zippered back pocket provides a secure storage spot. HeatGearŪ is best for weather between 55 and 75 degrees. 3" inseam. 87% nylon/13% spandex. Mesh insert: 84% polyester/16% spandex. Imported.