Under Armour size guide
How to Measure - Men's Tops
Chest: Place the tape measure under your arms in the widest part of your chest, wrap it around your body until your fingers intersect and mark the measurement.
Waist: Measure around your natural waistline. Be careful not to tighten too much to allow your little one to give.
| Chest (inches) | Waist (inches) | |
| XS | 30 - 32 | 26.5 - 27.5 |
| S | 34 - 36 | 28 - 29 |
| M | 38 - 40 | 30 - 32 |
| L | 42 - 44 | 34 - 36 |
| XL | 46 - 48 | 38 - 40 |
| XXL | 50 - 52 | 42 - 44 |
| 3XL | 52 - 54 | 44 - 46 |
| 4XL | 54 - 56 | 46 - 48 |
| 5XL | 56 - 58 | 48 - 50 |