Size Chart - Jonah
| Size | Length | Chest (pit to pit) |
| XXS | 68cm / 26 3⁄4 in | 53cm / 20 7⁄8in |
| XS | 68cm / 26 3⁄4in | 55cm / 21 5⁄8in |
| S | 71cm / 27 15⁄16in | 56cm / 22 1⁄16in |
| M | 72cm / 28 3⁄8in | 60cm / 23 5⁄8in |
| L | 73cm / 28 3⁄4in | 62cm / 24 7⁄16in |
| XL | 76cm / 29 1⁄2in | 64cm / 25 3⁄16in |
| XXL | 77cm / 30 5⁄16in | 66cm / 26in |