1) Measure your torso circumference just below your chest muscles. This can be done with a fabric tape measure or a piece of string and metal tape measure.
| NuMetrex™ Cardio Shirt Sizing Chart | |||
| M | L | XL | |
| rib cage below pecs (in) | 36-38 | 38-41 | 41-44 |
2) If this is not practical, use the following chart, and if your height and weight fall on a sizing border, we would recommend going to the smaller size for maximum performance.