Under Armour to Reiss clothing size
The short answer
Under Armour MD is Reiss 12 by the two brands' own charts.
Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.
| Under Armour | Under Armour builds it for | Reiss, by chart | Same label | Reiss builds it for | Reiss also prints |
|---|---|---|---|---|---|
| XXS | bust 31 to 32.5 in, waist 24.5 to 25.5 in | 6 | not published | bust 32 in, waist 25 in, hip 35 in | US 2 · Letter XS · FR 36 · IT 38 · AU 6 · EU (as printed) 34 |
| XS | bust 32.5 to 33.5 in, waist 25.5 to 27 in | 8 | not published | bust 33 in, waist 26 in, hip 36 in | US 4 · Letter S · FR 38 · IT 40 · AU 8 · EU (as printed) 36 |
| SM | bust 33.5 to 36 in, waist 27 to 29 in | 10 | not published | bust 35 in, waist 28 in, hip 38 in | US 6 · Letter S · FR 40 · IT 42 · AU 10 · EU (as printed) 38 |
| MD | bust 36 to 38 in, waist 29 to 31 in | 12 | not published | bust 37 in, waist 30 in, hip 40 in | US 8 · Letter M · FR 42 · IT 44 · AU 12 · EU (as printed) 40 |
| LG | bust 38 to 41 in, waist 31 to 34 in | 14 | not published | bust 39 in, waist 31.5 in, hip 42 in | US 10 · Letter M · FR 44 · IT 46 · AU 14 · EU (as printed) 42 |
| XL | bust 41 to 44 in, waist 34 to 37 in | 18 | not published | bust 43 in, waist 36 in, hip 46.5 in | US 14 · Letter L · FR 48 · IT 50 · AU 18 · EU (as printed) 46 |
| XXL | bust 44 to 47 in, waist 37 to 40 in | 18 | not published | bust 43 in, waist 36 in, hip 46.5 in | US 14 · Letter L · FR 48 · IT 50 · AU 18 · EU (as printed) 46 |
| 3XL | bust 47 to 50 in, waist 40 to 43 in | not made | not published | not published | not published |
What wearers say
Charts describe a garment, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.
Sources
- Under Armour size guide, read on 2026-09-18. Under Armour on TrueToSize
- Reiss size guide, read on 2026-09-18.