POL Womens Gray Crochet Tank Top Open Back Size Medium Girly Boho Festival. POL women's tank top. Crochet top half - sheer. Sleeveless. Laced back with tie - open back. Gray. Cotton, polyester and spandex fabric. Size medium. Measured laying flat: Measures 17.75" from armpit to armpit. Measures 24.75" long from mid back to hem.