MLB Women's Seattle Mariners Tank Top and Shorts Set: Shirt and shorts set Shirt: 60% cotton, 40% polyester. Shorts: 100% cotton Racerback tank top with front graphic, scoop neckline, mesh paneling, relaxed fit and straight hem Sleep shorts with elastic waistband and satin bow detail Machine wash cold with similar colors. Only non-chlorine bleach when needed. Tumble dry low. Cool iron if needed.