Forme Power Bra Posture Correcting Sports Bra in Obsidian Black, size Small. This innovative activewear piece is designed to improve your posture while providing support during workouts. Made with a blend of 75% polyester and 25% spandex for the body, and a lining of 70% nylon, 30% spandex, and a combination of 90% polyester and 10% spandex. It features a stylish open back design. Excellent pre-owned condition, no visible flaws.