You do not know your size, here is a table where you can classify your size.
Your chest circumference in cm | Your recommended size |
90-95 cm
| S |
95-100 cm
| M |
100-105 cm
| L |
105-110 cm
| XL |
110 - 115 cm
| XXL |
115-120 cm
| XXXL |
120-125 cm
| XXXXL |
125-130 cm
| 5XL |
130-135 cm
| 6XL |
Over 135 = please contact customer service :-)