Under Armour Girls' HeatGear Armour Solid Sports Bra 90% Polyester, 10% Elastane Fitted: Next-to-skin without the squeeze Super-light HeatGear fabric delivers superior coverage without weighing you down Signature Moisture Transport System wicks sweat to keep you dry and light Lightweight, 4-way stretch construction improves mobility and maintains shape Anti-microbial technology keeps your gear fresher, longer