Under Armour to Tommy Hilfiger size
The short answer
Under Armour XS is Tommy Hilfiger XXXS by the two brands' own charts. 6 of 8 Under Armour sizes land on a different label at Tommy Hilfiger.
Both brands publish the body chest each size is cut for, so every row matches a chest, not a letter.
On 1 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.
| Under Armour | Under Armour builds it for | Tommy Hilfiger, by chart | Same label | Tommy Hilfiger builds it for | Tommy Hilfiger also prints |
|---|---|---|---|---|---|
| XS | chest 31 to 34 in, waist 28 to 29 in | XXXS | XS | chest 31.5 to 32.5 in, waist 25.5 to 26.5 in, neck 11 to 11.5 in, sleeve 33.5 to 33.8 in | not published |
| SM | chest 34 to 37 in, waist 29 to 31 in | XS | not published | chest 35.5 to 36.5 in, waist 29.5 to 30.5 in, neck 13 to 13.5 in, sleeve 34.5 to 34.8 in | not published |
| MD | chest 37 to 41 in, waist 31 to 34 in | S or M | not published | chest 37.5 to 38.5 in, waist 31.5 to 32.5 in, neck 14 to 14.5 in, sleeve 35 to 35.3 in | not published |
| LG | chest 41 to 44 in, waist 34 to 37 in | L | not published | chest 41.5 to 42.5 in, waist 35.5 to 36.5 in, neck 16 to 16.5 in, sleeve 36 to 36.5 in | not published |
| XL | chest 44 to 48 in, waist 37 to 41 in | XL or XXL | XL | chest 43.5 to 45.5 in, waist 37.5 to 39.5 in, neck 17 to 17.5 in, sleeve 36.8 to 37 in | not published |
| XXL | chest 48 to 52 in, waist 41 to 45.5 in | XXL or XXXL | XXL | chest 47.5 to 49.5 in, waist 41.5 to 43.5 in, neck 18 to 18.5 in, sleeve 37.5 to 37.8 in | not published |
| 3XL | chest 52 to 56 in, waist 45.5 to 50 in | XXXL or XXXXL | XXXL | chest 51.5 to 53.5 in, waist 45.5 to 47.5 in, neck 19 to 19.5 in, sleeve 38.3 to 38.5 in | not published |
| 4XL | chest 56 to 60 in, waist 50 to 54.5 in | XXXXL | XXXXL | chest 55.5 to 57.5 in, waist 49.5 to 51.5 in, neck 20 to 20.5 in, sleeve 39 to 39.3 in | not published |
| 5XL | chest 60 to 64 in, waist 54.5 to 59 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
- Tommy Hilfiger size guide, read on 2026-09-18.