Under Armour to Nike clothing size
The short answer
Under Armour XXS is Nike XS by the two brands' own charts. 6 of 8 Under Armour sizes land on a different label at Nike.
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 | Nike, by chart | Same label | Nike builds it for | Nike also prints |
|---|---|---|---|---|---|
| XXS | bust 31 to 32.5 in, waist 24.5 to 25.5 in | XS | XXS | bust 29.5 to 32.5 in, waist 23.5 to 26 in, hip 33 to 35.5 in | not published |
| XS | bust 32.5 to 33.5 in, waist 25.5 to 27 in | S | XS | bust 32.5 to 35.5 in, waist 26 to 29 in, hip 35.5 to 38.5 in | not published |
| SM | bust 33.5 to 36 in, waist 27 to 29 in | S | not published | bust 32.5 to 35.5 in, waist 26 to 29 in, hip 35.5 to 38.5 in | not published |
| MD | bust 36 to 38 in, waist 29 to 31 in | M | not published | bust 35.5 to 38 in, waist 29 to 31.5 in, hip 38.5 to 41 in | not published |
| LG | bust 38 to 41 in, waist 31 to 34 in | L | not published | bust 38 to 41 in, waist 31.5 to 34.5 in, hip 41 to 44 in | not published |
| XL | bust 41 to 44 in, waist 34 to 37 in | XL | XL | bust 41 to 44.5 in, waist 34.5 to 38.5 in, hip 44 to 47 in | not published |
| XXL | bust 44 to 47 in, waist 37 to 40 in | XXL | XXL | bust 44.5 to 48.5 in, waist 38.5 to 42.5 in, hip 47 to 50 in | not published |
| 3XL | bust 47 to 50 in, waist 40 to 43 in | XXL | not published | bust 44.5 to 48.5 in, waist 38.5 to 42.5 in, hip 47 to 50 in | 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
- Nike size guide, read on 2026-09-18. Nike on TrueToSize