Thermal Size Guide
| Size | Cm | Inch |
| S | 78-82 | 30-32 |
| M | 82-88 | 32-34 |
| L | 88-92 | 34-36 |
| XL | 92-98 | 36-38 |
| XXL | 98-102 | 38-40 |
Note: Measure around your natural chest or waistline—right where it is fullest. Be careful not to squeeze too tight to allow a little flexibility. Round to the nearest whole number (ex. 33.5" rounded up to nearest whole number, your size is 34").