Super-light UA HeatGear® Sonic construction with HeatGear® ArmourVent™ Mesh Technology for unrivaled breathability. Signature Moisture Transport System wicks sweat to keep you dry and light. Lightweight stretch construction improves mobility for full range of motion. Anti-microbial technology fights odors to keep your gear fresher, longer. Smooth, bonded seams help eliminate chafing. Built-in bra for extra coverage and support. Athletic, skinny racer back detail. Polyester. Imported.