Under Armour Sizing Guide - (Mens & Womens) Tops
Men's Top
| Size | Chest (Inches) | Waist (Inches) |
| XS | 31-34 | 28-29 |
| SM | 34-37 | 29-31 |
| MD | 37-41 | 31-34 |
| LG | 41-44 | 34-37 |
| XL | 44-48 | 37-41 |
| XXL | 48-52 | 41-45½ |
| 3XL | 52-56 | 45½-50 |
| 4XL | 56-60 | 50-54½ |
| 5XL | 60-64 | 54½-59 |
Wome's Top
| Size | US Sizes | Bust (Inches) | Waist (Inches) |
| XXS | 00 | 31-32½ | 24½-25½ |
| XS | 0-2 | 32½-33½ | 25½-27 |
| SM | 4-6 | 33½-36 | 27-29 |
| MD | 8-10 | 36-38 | 29-31 |
| LG | 12-14 | 38-41 | 31-34 |
| XL | 16 | 41-44 | 34-37 |
| XXL | 18 | 44-47 | 37-40 |
| 3XL | 20 | 47-50 | 40-43 |
| 1X | 16W-18W | 44-47½ | 39-43½ |
| 2X | 20W-22W | 47½-51½ | 43½-48½ |
| 3X | 24W-26W | 51½-55 | 48½-53 |