Jumpbox Fitness On the Road to Rx - Navy Blue - Women's Triblend Racerback Tank Top Racerback tank top Form fitting. Flattering women's athletic cut. Runs big, consider ordering down one size. Triblend fabric. Ultra-soft, plenty of stretch, great moisture release 50% polyester, 25% cotton, 25% rayon Enjoy the journey at the Box. With every workout you're one step closer to Rx. Power through your next crossfit WOD in ultimate comfort.