Printed on a female-cut Bella 6682 tank with water base ink. The blank being used is black and it’s 52% airlume combed ring-spun cotton and 48% poly. The arm holes are raw edge and the back is a racerback cut.
You can view this link and the manufacturer size chart which lists the following:
|S||2 – 4|
|M||6 – 10|
|L||10 – 14|
|XL||14 – 18|
|2XL||18 – 20|
You can also view some sizing photos on the charcoal / black racerback tank product page, as that uses the same blank garment as this product — except for the colorway difference.