The conventional underwear size is generally used by numbers+letters. The number can be directly expressed by the lower bust size, and the ABCDE cup is expressed;

Sports underwear is special, and uses panties, clothes, pants and other sizes S, M, L, XL, XXL, XXXL for indicating directly

And sports underwear also has large cups and small cups. Of course, the size of each brand of sports underwear will be a bit different;

The underwear size of this brand I know is as follows:

Small cup underwear

M code corresponds to conventional 70-80AB

L code corresponds to conventional 80-85AB

Push to 2xl code

Large cup of underwear

M code corresponds to conventional 75-80cd

L code corresponds to conventional 80-85cd

Push to 3xl code