The 'Don't Cross Me' tank is made of 70% rayon bamboo, 25% cotton, and 5% spandex. Made of light, breathable fabric that doesn't hinder your movement; this tank speaks for itself.
Don't worry - it's long enough that you can do squats/burpees/sprawls without having to worry about your underwear showing, but not so long you feel like you're wearing a dress.