Under Armor XL Black raserback sports bra. Works best with A-C cups. Has keyhole

Classic pullover style with racer back design for enhanced range of motion & added keyhole design for extra ventilation UA Compression sports bras deliver strategic support, tailored for medium-impact activities like cycling, weight training & boxing Super-soft jacquard elastic band delivers a custom, stay-put fit HeatGear fabric delivers superior next-to-skin feel Material wicks sweat & dries really fast & light