Boxercraft Electric Blue Cotton and Spandex Racer Tank with Shelf Bra 90/10 Cotton/Spandex The Perfect Balance Between Fitness and Style! Constructed from 6.5 oz 90/10 cotton/spandex, providing flexible movement and excellent comfort. Sizes: X-Small (0-2), Small (2-4), Medium (6-8), Large (10-12), X-Large (14-16), 2X (18-20) Longer length tank features built-in shelf bra (on adult sizes only) and narrow racer back to help you move freely. Part of the b*sport practice line, the perfect balance between fitness and style.