Under Armour Bolo Tank - Women's The Under Armour Bolo Tank features a soft, open hole mesh construction that delivers superior breathability. Its Signature Moisture Transport System wicks sweat to keep you dry and light. The athletic, skinny racer back design unlocks mobility and is perfect for layering. Additional features include a spine pop stitch detailing and feminine scoop neck design. HeatGearŪ is best for weather between 75 and 100 degrees. 100% polyester. Imported.