It is US size.It is man size｣ｬbut man and women both can wear it.   Size XS:  Chest breadth:44cm    clothes length:65cm Size S:  Chest breadth:47cm    clothes length:67cm Size M:  Chest breadth:50cm    clothes length:69cm Size L:   Chest breadth:53cm    clothes length:71cm Size XL:   Chest breadth:56cm    clothes length:73cm Size XXL:   Chest breadth:59cm    clothes length:75cm Size XXXL:   Chest breadth:62cm    clothes length:77cm Size XXXXL:   Chest breadth:65cm    clothes length:79cm  Note: Please compare above detailed size with your measurement before purchase. Please allow 1-2cm differs due to manual measurement. Due to the difference between  different monitors｣ｬthe picture may not reflet the actual color of the item. We guarantee the style is the same as shown in the picture｣ｬbut not the same performance on different bodies as on the model.