The Under Armour Women's Seamless Longline Sports Bra is a top-rated racerback bra designed for active women. It features a seamless construction, reducing irritation and chafing. The bra has a longline design that provides extra coverage and support. It also has a racerback design that allows for a full range of motion. The bra is made from a blend of nylon and elastane, offering a comfortable and stretchy fit. With its high ratings and positive feedback, this racerback sports bra is a reliable choice for women who prioritize both style and functionality.