90 Degree Women's Racerback Tank Tops are super soft and moisture wicking. Racerback design hides your sportsbra strap in the back and the round bottom hem with side slits creates a sleek look in the gym or at home. 90 Degree Style Tank Top Manufacturer 90 Degree Product Type Womens Novelty Tank Tops Mpn TW10503-2PK. Racerback Style 2 Pack Rounded Hem With Side Slits Material: (White/Black) 90% Nylon; 10% Spandex Material: (All Other Colors) 88% Polyester; 12% Spandex.