they are all sized at 2x, but look at the measurements, basically it will fit from 32-40, i took a pair, tried it on and it fit me good, not tight, and i'm a 38, for some reason they sent me all the same sizes, if you want me to get more, let me know
 
15 for 1
25 for 2,
35 for 3
45 for all 4