HeatGear?? Armour is Under Armour's original performance baselayer???the layer you put on first and take off last. Give your athlete the performance baselayer she needs with the UNDER ARMOUR Girls' HeatGear?? Armour Bra. 90% Polyester, 10% Elastane. Fitted: next-to-skin, without the squeeze. Super-light HeatGear?? fabric delivers superior coverage without weighing her down. Material wicks sweat and dries fast. 4-way stretch construction moves better in every direction. Anti odor technology prevents the growth of odor-causing microbes. Thin back elastic straps with keyhole detail. Soft & stretchy printed elastic band. Imported.