Size guide is based on body measurement. Measure your own chest / waist with measuring tape in inches and select the size accordingly.
| Size | Chest (inches) |
| XXS | 30-32 |
| XS | 32-34 |
| S | 34-37 |
| M | 37-40 |
| L | 40-42.5 |
| XL | 42.5-45 |
| XXL | 45-48 |
| Size | Waist (inches) |
| S | 30-31 |
| M | 32-33 |
| L | 34-35 |
| XL | 36-37 |
| XXL | 38-41 |