Don't let the heat wave keep you from training. The Under Armour Women's Light As Air Sports Bra has an impossibly lightweight HeatGear fabric with a breathable mesh overlay to provide support while keeping you cool and comfy. Under Armour's Signature Moisture Transport System wicks sweat away from your skin to keep you dry and light, and it has four-way stretch construction for unrestricted mobility and to help it maintain its shape.