Spanx - Casual Fridays Tank TopFit, fabric and functionality. This tank top checks all the boxes. Ideal choice for both workouts and leisure. Featuring a sleeveless design. Crafted from sweat wicking polyester with 4 way stretch to ensure it moves with you. Relaxed fit includes a back pleat and a curved hem for extra coverage in the back. Composed of 88% Polyester, 12% Elastane. Machine wash cold on a gentle cycle and tumble dry low.