Womens Sprite Racerback Bra XL - Black. A soft and supportive womenâs racerback bra made with our merino wool jersey corespun fabric, the Sprite Racerback Bra features improved cup shaping and an open back design that improves freedom of movement. Our highly breathable corespun fabric uses nylon fibers wrapped in merino wool for added strength and durability that maintains next-to-skin softness, and we added a power mesh lining to improve moisture management and comfort. The no-side-seam design prevents underarm chafing when youâre on the move. For more fun, wear this bra with our Sprite Hot Pants in various colors.